01539oam 2200433 a 450 99632017970331620190927124507.0(CKB)3830000000000343(OCoLC)754209833(EXLCZ)99383000000000034320110923d2010 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierWhen biospheres collide a history of NASA's planetary protection programs[electronic resource] /by Michael MeltzerWashington, D.C. :NASA Aeronautics and Space Administration,2010.1 online resource (xx, 522 pages) illustrationsNASA SP ;2011-4234Title from title screen (viewed on Sept. 23, 2011).Paper version available for sale by the Supt. of Docs., U.S. G.P.O.Includes bibliographical references and index.When Biospheres CollideSpace pollutionSpace environmentEnvironmental protectionMoral and ethical aspectsOuter spaceExplorationEnvironmental aspectsSpace pollution.Space environment.Environmental protectionMoral and ethical aspects.Meltzer Michael1946-1168265GPOGPOGPOBOOK996320179703316When biospheres collide2720773UNISA