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Subject
- Maps17
- Discovery and exploration10
- Discoveries in geography9
- British7
- History7
- Indians of North America6
- Geology5
- Russian5
- Colonies3
- Natural gas3
- Navigation3
- Petroleum3
- Administrative and political divisions2
- Cartes2
- Coasts2
- Geological cross sections2
- Geology, Stratigraphic2
- Nautical charts2
- Oak2
- Ordovician Geologic Period2
