Voices for the Wilderness

acres Africa Alaska Aldo Leopold American biocentric California century civilization concept Congress conservation conservation movement conservationists continue cost destroyed earth Echo Park ecological economic ecosystem energy environment example exploitation fact Federal feel fire fish forest forest ecosystem Fort Yukon frontier future habitat Hetch highway Howard Zahniser human important industry interest John Muir lake landscape living look man's means ment million mountains national forests National Park Service natural beauty natural resources ness Olympic National Park open space organization Orville Freeman outdoor recreation perhaps plants and animals population problem production protection Rampart river roads scenic sense Sierra Club species spiritual things timber tion trees West wild lands wilderness areas Wilderness Bill Wilderness Conference wilderness preservation wildlife Yosemite