Title: America's natural places
Subjects: Protected areas, Endangered ecosystems, Protected areas -- Pacific States, Protected areas -- Southwest, New, Protected areas -- Alaska, Protected areas -- Hawaii, Endangered ecosystems -- Pacific States, Endangered ecosystems -- Southwest, New, Endangered ecosystems -- Alaska, Endangered ecosystems -- Hawaii, Protected areas -- Southern States, Endangered ecosystems -- Southern States, Protected areas -- Rocky Mountains Region, Protected areas -- Great Plains, Endangered ecosystems -- Rocky Mountains Region, Endangered ecosystems -- Great Plains, Protected areas -- East (U.S.), Endangered ecosystems -- East (U.S.), Public lands, united states, Nature conservation, Public lands, Biotic communities, Rocky mountains
Places: Middle West