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Renewahle Resources and Human Populations
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agencies Aldo Leopold American Forestry American Forestry Association animals birds buffalograss century Congress Conservation Movement coordinated crops dams demands Department of Agriculture depletion drainage ecological erosion established estry farm farmers federal government Fish and Wildlife fisheries flood control forage forest land Gila Wilder grass grasslands grazing growing growth habitat human important improvement increase industrial interest irrigation land and water laws livestock living ment million acres mountain national forests National Park natural resources numbers organizations passenger pigeon pasture percent plants plowed pollution population practices prairie problems production programs protection public lands range land recreation renewable resources rivers soil conservation districts Soil Conservation Service species sport streams supply timber tion tive trees trout U. S. Department U. S. Forest Service United vegetation Washington water management waterfowl watershed western wild wildlife management wood woodland Yellowstone National Park York