Conservation in the United States

agencies air pollution annual areas cent coal coastal commercial forest land Copyright by Rand crop cropland dams Department of Agriculture dollars Douglas-fir economic eral erosion especially established estimated facilities farm farmers feet Figure fish fisheries forage Forest Service forestry future grass grassland grazing ground water growth habitat harvest important improvement increase industry irrigation Lake land capability Land Management livestock loams major McNally & Company ment million acres mineral mineral resources mining National Forest National Park National Park Service natural nomic outdoor recreation ownership Pacific pasture petroleum plants population potential practices problems production projected public domain lands Rand McNally range range land region regulation reserve result sawtimber Scale in Miles significant slopes Soil Conservation Service sources surface TABLE Tennessee Valley Authority timber tion tons trees United urban utilization Washington water resource watershed wildlife