U.S. Geological Survey, 1979, Land use and land cover and associated maps for Grand Canyon, Arizona: U.S. Geological Survey Open-File Report 79-1494, 5 sheets, scale 1:250,000.
U.S. Geological Survey, 1979, Land use and land cover and associated maps for Grand Canyon, Arizona: U.S. Geological Survey Open-File Report 79-1494, 5 sheets, scale 1:250,000.
Land-use Planning, Law, Water Resources, Groundwater, Hydrology,