004100000a2200133000450024500850000065000210008565000200010665000280012665000190015465100190017304100130019210000230020577300480022810aEvolution of the U.S. national wildlife system and the doctrine of compativility14aAreas protegidas14aFauna silvestre14aPolíticas ambientales14aConservación 4pEstados Unidos0 aInglés1 aCurtin, Charles G.1 tConservation Biology324h1q29-38d1993g7