The American Environment: Readings in the History of ConservationRoderick Nash |
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action Administration agriculture Aldo Leopold American conservation animals areas beauty Brower Canyon century citizens civilization concept concern Congress conservation movement conservationists earth Echo Park ecological economic effects environment environmental movement environmental problems erosion fact federal fish Forestry Franklin D future George Perkins Marsh Gifford Pinchot growth Hetch Hetchy human idea important industry interest irrigation landscape Limits to Growth living major material ment minerals mountain National Forests National Park Service National Wilderness Parks natural resources organization physical planning political pollution population preservation Press Principle Progressive Progressive conservation protection public lands Reclamation recreation region river Roosevelt Santa Barbara scenery Sierra Club social society soil streams timber tion trees United University urban Valley visitors waste wild wildlife York Yosemite Yosemite National Park