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Subject
Real property
37
Railroads
33
Geology
21
Administrative and political divisions
13
Aerial views
12
Harbors
12
Land use
8
Landowners
8
Mines
8
Mining
8
Discovery and exploration
7
American Civil War
6
Canals
5
Cities and towns
5
Polar regions
5
Roads
5
Botanical gardens
4
Explorations and surveys
4
Mineral resources
4
Forts
3