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Subject
- North America—Maps—Early works to 180059
- Power resources18
- Biota14
- New England—Maps—Early works to 180014
- Elevation12
- Geoscientific Information12
- Imagery and Base Maps12
- Natural gas12
- Inland Waters10
- Railroads10
- Rivers10
- Roads10
- Transportation10
- Hydrography9
- Middle Atlantic States—Maps—Early works to 18009
- Administrative and Political Boundaries8
- Digital elevation models8
- Geomagnetism8
- Great Britain—Colonies—America—Maps—Early works to 18008
- Oceans8