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Subject
- Geology[remove]355
- Hydrology[remove]355
- Mines and mineral resources56
- Geological surveys41
- Research36
- Groundwater and aquifers34
- Groundwater32
- Wells30
- Rivers, creeks, streams, etc24
- United States Geological Survey Water-supply Paper22
- Water-supply20
- Artesian wells19
- Water19
- United States. Geological Survey17
- Water and water supply17
- Watersheds16
- Irrigation15
- Paleontology14
- Federal receipts and expenditures12
- Financial statements12