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Subject
Inland Waters
5
Polar regions
5
Roads
5
Botanical gardens
4
Explorations and surveys
4
Mineral resources
4
Forts
3
Imagery and Base Maps
3
Inland navigation
3
Location
3
Nautical charts
3
Oceans
3
Rivers
3
Street-railroads
3
Utilities and Communication
3
American Indians
2
Battle of Bull Run
2
Cartouches
2
Colonies
2
Copper mines
2