The American Environment: Readings in the History of Conservation

acres Administration aesthetic agriculture Aldo Leopold American conservation animals areas Arid Region Bureau canyons century cities civilization concern Congress conservation movement conservationists Dinosaur National Monument earth Echo Park economic effective environment erosion ethic fact farm fish Forest Service forestry Franklin D frontier future Gifford Pinchot grass growth Hetch Hetchy Hetch Hetchy Valley human idea important individual industry interest irrigation John Wesley Powell Knowles land ethic landscape laws living material means ment metropolitan minerals Monument mountain multiple National Forests National Park natural beauty natural resources organized physical planning pollution population present preservation President problems production Progressive conservation protection public lands reclamation recreation reservoir result river Robert Underwood Johnson Roosevelt scenery scientific society soil streams Theodore Roosevelt timber tion trees United Valley waste wild wilderness wildlife Yosemite Yosemite National Park