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