udall tallman argued decided march since promulgation secretary interior consistently construed executive order public land order relating disposition public lands located kenai national moose range alaska bar issuance oil gas leases interpretation made repeated matter public record number leases developed great expense reliance therefore interpretation orders unreasonable courts must respect pp secretary interpretation executive order withdrew lands covered settlement location sale entry disposition except fish trap sites laws applicable alaska though interpretation permitted language order reasonable interpretation pp wilbur ex rel barton app aff sub nom ex rel mclennan wilbur distinguished pp reasonableness secretary interpretation public land order follows fortiori reasonableness interpretation executive order wayne barnett argued cause petitioner briefs solicitor general cox roger marquis edmund clark charles wheatley argued cause respondents brief robert mccarty briefs amici curiae urging reversal filed clayton orn marvin sonosky oscar chapman martin friedman marion plant marathon oil company et abe fortas joseph ball gordon goodwin francis kirkham turner mcbaine clark clifford richfield oil corporation et al chief justice warren delivered opinion issue case effect executive order public land order upon secretary interior authority issue oil gas leases october january griffin persons hereinafter collectively referred griffin lessees filed applications oil gas leases approximately acres located kenai national moose range alaska august respondents filed offers lease lands section mineral leasing act provides relevant part person first making application lease qualified hold lease shall entitled lease lands without competitive bidding stat amended stat bureau land management department interior determined griffin lessees persons applied first issued leases tracts effective september respondents applications reached processing october rejected ground lands leased prior applicants rejection applications respondents appealed director bureau land management secretary interior affirmed decision respondents brought action nature mandamus district district columbia compel secretary issue oil gas leases district granted summary judgment favor secretary dismissing complaint appeals district columbia circuit reversed holding executive order order creating moose range public land order issued secretary withdrawn lands controversy availability leasing mineral leasing act lands remained closed leasing reopened revised departmental regulation august therefore held griffin applications filed land closed ineffective rendering leases issued nullities respondents persons first making application promulgation regulation held entitled leases app granted certiorari conclude district correctly refused issue writ mandamus accordingly reverse decision appeals since promulgation secretary consistently construed orders bar oil gas leases moreover interpretation made repeated matter public record griffin leases others located moose range developed reliance upon secretary interpretation respondents claim relied detriment upon contrary construction secretary interpretation may one permitted language orders quite clearly reasonable interpretation courts must therefore respect mclaren fleischer bowles seminole rock mineral leasing act stat et seq ed gave secretary interior broad power issue oil gas leases public lands within known geological structure producing oil gas field although act directed lease issued tract issued first qualified applicant left secretary discretion refuse issue lease given tract ex rel mclennan wilbur act excluded application certain designated lands exclude lands within wildlife refuge areas kenai national moose range created executive order fed reg approximately two million acres public domain set aside refuge breeding ground moose order provided one lands excepting defined area shall subject settlement location sale entry disposition except fish trap sites laws applicable alaska november secretary promulgated first general regulation dealing issuance oil gas leases within wildlife refuges provided simply leases subjected approved unit plan contain provision prohibiting drilling prospecting without advance consent secretary fed reg june secretary issued public land order fed reg public lands within areas alaska including portion moose range excepted executive order hereby temporarily withdrawn settlement location sale entry classification examination aid proposed legislation order shall take precedence shall modify reservation kenai national moose range made executive order december public lands alaska hereby withdrawn forms appropriation laws including mining laws laws memorandum dated august director bureau land management advised regional administrators bureau managers local land offices possible revision policy regulations leasing wildlife refuges studied directed ending completion study possible revision existing regulations suspend action pending oil gas lease offers applications lands within refuges disputed subsequent memoranda make clear memorandum purport prevent either issuance leases approval national office continued filing lease offers late early number individuals filed applications oil gas leases northern half moose range among applications griffin lessees action suspended accordance directive none rejected ground land question closed leasing september secretary issued public land order fed reg revoking entirety public land order granting certain preferences provided lands described paragraphs order remaining unappropriated shall become subject application petition selection form appropriation public generally may authorized laws including laws commencing day date order unsurveyed lands described paragraph settled upon veterans persons entitled credit service shall become subject settlement forms appropriation public generally including leasing laws emphasis added december anticipated revision regulation promulgated fed reg restrictive old regulation gave increased power fish wildlife service approve disapprove oil gas development refuges listed appendix number refuges including kenai importance preservation rare species plant animal life leasing permitted appendix listed certain areas including small part moose range involved respect fish wildlife service reports oil gas development might seriously impair destroy usefulness lands wildlife conservation purposes appendix areas leasing permitted upon approval director fish wildlife service complete detailed operating program area wildlife areas regulation provided il gas leases may issued provided contain specified conditions requiring approval fish wildlife service type prospecting conducted adoption lessee unit plan approved service respondents argue even assumed clearly case regulation treated lands controversy open leasing regulation probative availability lands leasing prior therefore evidence secretary viewed lands open leasing time griffin applications filed think however secretary opinion changing status part moose range covered appendix rather merely imposing additional restrictions leasing therein done terms express used regulation refer range whole reference name parts range specified order except general provision il gas leases may issued wildlife refuges though specification supports inference regulation drafted assumption remainder range open leasing indirect implication however clearly confirms preexisting availability range technique inappropriate effecting change range status moreover president delegation secretary power make modify withdrawals directed orders issued secretary interior authority order shall designated public land orders shall submitted filing publication federal register executive order fed reg emphasis added may document labeled public land order legal effect constitute exercise power however secretary meant exercise power likely done manner directed president delegation bills introduced congress early restrict oil gas leasing wildlife refuges house committee merchant marine fisheries subcommittee merchant marine fisheries senate committee interstate foreign commerce held extensive hearings thereon bills introduced forbade secretary dispose lands wildlife refuges question arose hearings whether language apply issuance oil gas leases representative department asserted without contradiction granting oil gas lease disposition affected language proposed hearings house committee merchant marine fisheries amendment accordingly proposed specifically restricting oil gas leasing neither committee reported favorably bills however house committee submitted report stating decided try experimental period time arrangement whereby proposed alienation relinquishment interest fish wildlife service lands jurisdiction submitted committee within days approve disapprove action contemplated pp resolution issue suggests committee accepted department view secretary authority grant oil gas leases moose range concerned way exercised discretion pursuant agreement house committee merchant marine fisheries held public hearings july proposal fish wildlife service issuance oil gas leases acres northern half moose range located within area encompassed executive order lease applications filed amicus curiae richfield oil corporation others proposal contemplated leases subject swanson river unit plan operation approved bureau land management geological survey fish wildlife service branches department interior hearing proposal spokesman national wildlife federation urged executive order precluded issuance leases transcript hearing house committee merchant marine fisheries july lease portions kenai national moose range pp see pp letter july deputy solicitor department interior hon bartlett delegate congress alaska following july however committee chairman advised director fish wildlife service committee unanimously concluded issuance leases detrimental wildlife values moose range concurred proposal issue leases following committee approval leases issued exploratory well drilled oil discovered commercial quantities july see alaska gov secy int secy int swanson river leases soon became subject congressional concern secretary interior realizing although authority issue leases dry land lacked authority respect lands beneath alaskan inland navigable waters asked congress authority issue leases alaskan water bottoms add leases already issued alaska applications pending water bottoms within boundaries senate committee reported favorably proposed bill saying alaska present time one area subject mineral leasing act oil gas known exist paying quantities kenai peninsula previously described prior effective date act producing structure kenai defined holders upland leases areas might forced compete areas beneath adjacent lakes streams committee felt result work disadvantage lessees developers gone ahead developed area meanwhile controversy leasing policies followed wildlife refuges resolved adoption january another complete revision regulation fed reg cfr revision represented victory conservationists altogether prohibited oil gas leasing unless necessary prevent draining wildlife refuges two exceptions lands withdrawn dual purpose wildlife refuges located alaska lands falling within two excepted categories bureau land management fish wildlife service reach agreements specifying lands shall subject oil gas leasing decide provisions required leases issued remaining lands agreements become effective upon approval secretary publication federal register regulation provided pending offers applications heretofore filed oil gas leases covering game ranges coordination lands alaska wildlife areas continue suspended agreements referred shall completed new lease applications accepted filing tenth day agreements noted land office records pursuant regulation published federal register august order secretary announcing agreement reached respect moose range fed reg order decreed certain lands within range essentially southern half hereby closed oil gas leasing activities incompatible management thereof wildlife purposes provided balance lands within kenai national moose range subject filing oil gas lease offers offers lease covering lands pending upon action suspended accordance regulation cfr acted upon adjudicated accordance regulations ease offers lands excluded leasing accepted filing tenth day agreement map noted records land office soon issuance regulation implementing order pending applications acted upon within next two months leases covering acres issued area subject executive order response applications including griffin lessees filed figures added covering leases issued prior primarily swanson river area appears area subject executive order secretary issued total leases covering acres applications filed period appeals held area closed leasing thus prior commencement instant suit secretary leased substantially entire area controversy solicitor general assures us lessees assignees turn expended tens millions dollars development leases ii faced problem statutory construction shows great deference interpretation given statute officers agency charged administration sustain commission application statutory term need find construction reasonable one even result reached question arisen first instance judicial proceedings unemployment aragon see also gray powell universal battery particularly respect due administrative practice stake involves contemporaneous construction statute men charged responsibility setting machinery motion making parts work efficiently smoothly yet untried new power reactor electricians construction administrative regulation rather statute issue deference even clearly order since involves interpretation administrative regulation must necessarily look administrative construction regulation meaning words used doubt ultimate criterion administrative interpretation becomes controlling weight unless plainly erroneous inconsistent regulation bowles seminole rock moreover discussion section opinion demonstrates secretary consistently construed executive order public land order bar oil gas leases may argued facts rulings prove usage establish validity government practical affair intended practical men officers citizens naturally adjust action executive department presumption unauthorized acts allowed often repeated crystallize regular practice presumption reasoning circle basis wise quieting rule determining meaning statute existence power weight shall given usage even validity practice subject investigation midwest oil practical administration act officers land department adopted given effect latter view adopted present controversy arose thought except departure soon reconsidered corrected adhered followed ever since many outstanding titles based upon much said support reasonable construction act least admissible one therefore comes within rule practical construction given act congress fairly susceptible different constructions charged duty executing entitled great respect acted upon number years disturbed except cogent reasons iii executive order fed reg provided none lands excepting described area shall subject settlement location sale entry disposition except fish trap sites laws applicable alaska classification lease provisions act july entitled act provide leasing public lands alaska fur farming purposes stat title secs act march entitled act provide protection development utilization public lands alaska establishing adequate system grazing livestock thereon stat title secs settlement location sale entry terms contemplating transfer title lands question therefore reasonable secretary construe disposition encompass dispositions like four enumerated convey lead conveyance title example grants allotments cf opinion solicitor oil gas lease vest title lands lessee see boesche udall moreover term laws ordinarily used refer statutes governing alienation public land generally distinguished mining laws referring statutes governing mining hard minerals public lands mineral leasing laws term used designate group statutes governing leasing public lands gas oil compare title public lands title mineral lands mining respondents reliance upon wilbur ex rel barton app aff sub nom ex rel mclennan wilbur misplaced involved wilbur meaning language contained pickett act stat president may time discretion temporarily withdraw settlement location sale entry public lands including district alaska aid proposed legislation affecting use disposition petroleum deposits public domain public lands defined area million acres california wyoming hereby temporarily withdrawn forms location settlement selection filing entry disposal mineral nonmineral public land laws geological survey bull doc quoted mineral leasing act changed procedure acquiring oil gas rights public lands secretary empowered issue prospecting permits required event discovery made permit issue lease entitled lessee extract mineral gave right land therefore language pickett act longer technically encompassed leasing nonetheless clear act specifically designed legitimize orders like withdrawal order appeals reasonably concluded wilbur fact congress changed procedure location leasing acquisition oil gas rights afforded reason concluding thereby intended cut back power granted app thus neither holding appeals affirmance way casts doubt upon reasonableness secretary interpretation orders bar drafted long mineral leasing act done away location means acquiring oil gas rights placement fish trap exception except fish trap sites phrase admittedly relating alienation title land tend cut secretary interpretation executive order however appears exception designed assure alaskans whose livelihood largely dependent salmon catch continue despite order use fish traps cf organized village kake egan since reassurance technically necessary therefore functionally related part regulation surprise find carelessly placed compare executive order fed reg establishing kodiak national wildlife refuge think position fish trap exception sufficient justify overturning secretary construction unreasonable public land order withdrew lands covered settlement location sale entry contained reference disposition contain anything analogous fish trap exception reasonableness secretary interpretation public land order therefore follows fortiori reasonableness construction executive order reversed footnotes public land order encompassed land respondent coyle applied land nine respondents filed covered executive order section act excludes lands acquired act known appalachian forest act approved march stat incorporated cities towns villages national parks monuments acquired acts subsequent february lands within naval petroleum reserves except hereinafter provided stat amended stat see public land order august fed reg withdrew acres civil aeronautics administration acres townsite purposes public land order december fed reg withdrew number tracts aggregating acres use army see memorandum february director bureau land management assistant secretary interior memorandum august director bureau land management area administrator area alaska cong rec report fiscal year ending june governor alaska stated residents alaska major oil companies continued file lease applications send exploratory parties various parts territory kenai moose reserve kenai peninsula covered lease applications awaiting decision secretary interior stipulations protection wildlife inserted leases issued alaska gov see also secy int appears bureau regarded amended regulations automatically vacating suspension order however upon almost immediate introduction congress bills restrict leasing wildlife refuges field offices directed withhold final action lease applications see richard todd et support claim regulation worthless indication status lands covered thereby respondents urge appendix listed wildlife refuges closed terms orders creating however refuges listed appendix respondents point one salt plains oklahoma moreover small part salt plains acres specifically withdrawn appropriation mining laws public land order fed reg therefore doubtful simple listing appendix salt plains large parts admittedly open leasing prior intended open small area closed public land order respondents seek capitalize fact although swanson river unit located areas designated appendix regulation applicants submitted obtained service approval detailed operating program unit least two possible explanations submission plan first fish wildlife service time designate areas listed appendix leasing might seriously impair destroy conservation purposes accordingly require advance approval operating programs submission plan swanson river unit might regarded means insuring service designate area second secretary directed subordinates withhold final action lease applications pending revision regulations applicants may submitted plan order persuade department house committee proposed leasing consistent existing regulations also likely adopted hearings senate committee interior insular affairs proposed bill gordon goodwin attorney amicus curiae richfield oil corporation testified well pending years applications leases kenai moose range leases issued discovery made shortly time secretary suspended leasing moose range never lifted yet able much business except limited extent hearings senate committee interior insular affairs announcing order secretary warned little land available new applicants lands covered applications adjudicated regulations department department interior press release july respondents point fact press release dated january announcing forthcoming august order secretary indicated opening part moose range leasing choice term wholly understandable view facts general instructions local offices take final action lease applications outstanding since regulations january provided new applications accepted filing subsequent order issued specifying lands subject leasing therefore order august two senses open range leasing area excepted executive order encompassed public land order total number leases issued applications filed revocation latter order covering acres see ex parte endo boesche udall cf peters hobby cf brooks dewar failure attach proper significance administrative practice seems attributable fact misinformed concerning practice respondents brief appeals stated leases issued lands within kenai range discovery well increased activity areas peninsula outside kenai national moose range view taken hoffman oil gas leasing public domain reference language withdrawal orders fruitful amici curiae list executive public land orders issued contained language expressly barring mineral leasing brief marathon oil union oil california amici curiae pp however respondents list orders issued expressly permitting mineral leasing brief respondents pp appeals sought explain reference acts construing phrase laws applicable alaska mean laws applicable throughout country alaska opined acts specifically added application alaska however secretary interpretation laws applicable alaska including inter alia laws relating public lands located alaska least natural appeals interpretation limiting phrase laws applicable throughout country beyond cavil reasonable interpretation test appeals applying moreover appeals conclusion disposition meant include leasing renders words classification lease initiating reference acts superfluous prospecting permit procedure eliminated present direct leasing procedure substituted act august stat