Geology 226 Coal 58 San Juan County (N.M.) 51 Uranium ores 49 Mines and mineral resources 12 Groundwater 10 Geology, Stratigraphic 8 Rio Arriba County (N.M.) 8 Uranium mines and mining 8 Land titles Registration and transfer 7 Water Pollution 7 San Juan County (Utah) 6 Water quality 6 Acid mine drainage 5 Drill cores 5 Geology, Structural 5 Indians of North America Antiquities 5 Ore deposits 5 Public lands 5 Railroads 5 Transportation Planning 5 Utah 5 Vanadium ores 5 Biogeochemical prospecting 4 Groundwater Quality 4 Hydrogeology 4 Land use, Rural 4 San Juan County (Utah) Antiquities 4 Transportation and state 4 Avalanches 3 Coal Geology 3 Colorado 3 Excavations (Archaeology) 3 Irrigation Environmental aspects 3 Land use 3 McKinley County (N.M.) 3 Mines and mineral resources Cost of operation 3 Mines and mineral resources Management 3 Radioactive substances 3 Rare plants 3 Selenium Environmental aspects 3 Soil surveys 3 Soils 3 Stratigraphic correlation 3 Abandoned mines Environmental aspects 2 Acid mine drainage Environmental aspects 2 Avalanches History 2 Bears Ears National Monument (Utah) History 2 Borings 2 Canyons 2 Carnotite 2 Cliff dwellings 2 Faults (Geology) 2 Fills (Earthwork) 2 Garfield County (Utah) 2 Geochemical prospecting 2 Geology, Economic 2 Groundwater Pollution 2 Groundwater flow 2 Hazardous wastes 2 Hydrology 2 Kane County (Utah) 2 La Plata County (Colo.) 2 Land use Law and legislation 2 Metals Environmental aspects 2 Mines and mineral resources Environmental aspects 2 Natural gas pipelines Environmental aspects 2 New Mexico 2 Oil fields 2 Outdoor recreation 2 Petroleum Analysis 2 Physical geography 2 Plant indicators 2 Precipitation (Meteorology) Mathematical models 2 Property tax 2 Prospecting 2 Radioactive prospecting 2 Radioactive waste disposal in the ground 2 Real property tax 2 Reptiles, Fossil 2 Runoff Mathematical models 2 San Juan County (Colo.) 2 San Juan County (Utah) Description and travel 2 San Juan County (Utah) History 2 Sediments (Geology) 2 Silver mines and mining 2 Tourism 2 Vegetation surveys 2 Water-supply 2 Acid pollution of rivers, lakes, etc 1 Animal species 1 Animals, Fossil 1 Animas Mining District (Colo.) 1 Animas River Watershed (Colo. and N.M.) Environmental conditions 1 Archaeological surveying 1 Arizona 1 Artificial groundwater recharge 1 Bears Ears National Monument (Utah) Antiquities 1 Behind the Rocks Wilderness (Utah) 1 Biodiversity 1