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abundant acres agricultural alfalfa animals areas B. C. MCLEAN beaver blowing BRIXNER buffalo CARL HOLZMAN cattle cattlemen climate Colorado River Colorado River Basin Committee crops cultivation dams Denver depletion destroyed destructive ditches drainage dry farming dust storms E. R. WELLINGTON earth eastern farmers Federal feed fence floods flow forage geologic gold grass grasslands grazing grow gullies herds homestead inches increase Indians industry irrigated land irrigation land planning LAND PROBLEM livestock living Mexico miners mining moisture Montana City National Forest natural resources overgrazed parent material pattern period plains plains Indians plants plateaus plowed practices production protect Pueblo railroad rain rainfall range land Region 8 Albuquerque reservoirs Rocky Mountains sagebrush San Luis Valley settlement sheep silt Soil Conservation Service Soil Erosion District storage streams surface tion topsoil transcontinental railroad trappers trees vegetative cover water supply watershed western Colorado western slope wind