The green web a union for world conservation

द्वारा Holdgate, M. W.
प्रकाशित 1999

American environmentalism readings in conservation history

प्रकाशित 1990

A documentary history of conservation in America

द्वारा McHenry, Robert
प्रकाशित 1972

The American environment readings in the history of conservation

द्वारा Nash, Roderick
प्रकाशित 1968

The politics of conservation

द्वारा Smith, Frank Ellis 1918-
प्रकाशित 1966