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Subject
- Maps28
- Discovery and exploration21
- Discoveries in geography17
- Russian12
- History10
- British8
- Indians of North America6
- Colonies5
- Geology5
- Discovery and exploration, Russian3
- Natural gas3
- Navigation3
- Petroleum3
- Administrative and political divisions2
- Cartes2
- Coasts2
- Geological cross sections2
- Geology, Stratigraphic2
- Nautical charts2
- Oak2
