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Subject
- Ocean bottom28
- Submarine topography27
- Geology, Structural21
- Geology, Stratigraphic19
- Geology15
- Marine sediments7
- Sediments (Geology)7
- Agricultural resources5
- Earthquakes5
- Seismology5
- Faults (Geology)3
- Land use3
- Land use, Rural3
- Petroleum3
- Census districts2
- Coal2
- Economic zoning2
- Ethnology2
- Groundwater2
- Interstate commerce2