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Subject
- Afghanistan -- Maps96
- Geological Survey (U.S.)67
- Seismic reflection method67
- Geology, Stratigraphic -- Cretaceous50
- Volcanoes -- Hawaii47
- Water quality -- United States46
- Geological Survey (U.S.) -- Bibliography44
- Digital mapping41
- Geology, Stratigraphic -- Cenozoic39
- Rocks -- Analysis38
- Water -- Analysis38
- Geology, Stratigraphic -- Quaternary37
- Mines and mineral resources -- Alaska37
- Geology -- Afghanistan -- Maps36
- Groundwater flow -- Computer simulation35
- Groundwater flow -- Mathematical models34
- National Water-Quality Laboratory (U.S.)34
- Geology, Stratigraphic -- Tertiary33
- National Water-Quality Assessment Program (U.S.)33
- Geology, Stratigraphic32