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Subject
- Geology104
- Mines and mineral resources27
- Geology, Stratigraphic11
- Navigation9
- Maps6
- Nautical charts6
- Triangulation6
- Administrative and political divisions5
- Geomagnetism4
- Commerce3
- History3
- Oil fields3
- Banks and banking2
- Cartes2
- Gas fields2
- Geology, Structural2
- Natural gas2
- Railroads2
- Real property2
- Aeronautical charts1
