Subject
Geology, Stratigraphic
52
Geology
11
Uranium ores
10
Phosphate rock
6
Uranium
4
Mines and mineral resources
3
Earth resistance (Geophysics)
2
Geology, Structural
2
Petrology
2
Radioactive prospecting
2
Radioactive waste disposal
2
Sedimentary rocks
2
Shale
2
Stratigraphic correlation
2
Thorium
2
Volcanic ash, tuff, etc
2
Waste disposal in the ground
2
Aerial photography in geology
1
Aquifers
1
Batholiths
1
Bone Valley (Fla.)
1
Boring
1
Crystalline rocks
1
Geological mapping
1
Geological time
1
Granite
1
Groundwater
1
Groundwater flow
1
Igneous rocks
1
Lignite
1
Lithofacies
1
Mineralogy
1
Monument Valley (Ariz. and Utah)
1
Nevada National Security Site (Nev.)
1
Oil-shales
1
Phosphates
1
Porosity
1
Prospecting
1
Radioactive waste repositories
1
Radioactivity Measurement
1
Salt domes
1
Settling basins
1
Thermoluminescence
1
Thorium ores
1
Underground nuclear explosions
1
Vanadium ores
1
Wavellite
1