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Subject
- Census districts4
- Metropolitan areas4
- Transportation3
- Aquifers2
- Groundwater2
- Electric power transmission1
- Gas fields1
- Gas pipelines1
- Geophysical surveys1
- Geophysics1
- Hazardous waste sites1
- Marine mineral resources1
- Marine sediments1
- Mexican War, 1846-18481
- Mexico City National Cemetery (Mexico)1
- Mines and mineral resources1
- National cemeteries, American1
- Natural gas1
- Oil fields1
- Petroleum1