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From Migration to Conservation
Focus on the United States
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Aldo Leopold American animals areas basin cent coal commercial cover crop land cultivation damage Department of Agriculture depletion destruction drainage drainage basin drained economic example farm farmers federal fire fish fisheries flood flow forest land grass grasslands grazing ground water growth gullies H. H. Bennett humid improvement increased industry irrigation lakes land reclamation less limited measures ment methods mineral mining national forests natural gas natural resources nitrogen owners parks pasture petroleum phosphorus Plains plant nutrients plow pollution practices problem production protection rain rainfall range reclamation reduce region reservoirs result river runoff scenic shifting cultivation silt slope Soil Conservation soil erosion sources South southern streams surface timber tion trees U.S. Department U.S. Forest Service United Valley vegetation waste water power water supply West western wet lands wildlife William Vogt Wisconsin wood