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Subject
- Cartography50
- Discovery and exploration22
- Surveying21
- Maps19
- Geodesy10
- Hydrographic surveying9
- United States9
- Astronomy8
- Cost8
- Description and travel8
- Geological surveys8
- Geology7
- U.S. Coast and Geodetic Survey7
- Indians6
- Rivers, creeks, streams, etc6
- Territories and possessions6
- Boundaries5
- Ethnology5
- Fossils5
- Mines and mineral resources5