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Subject
Real property
37
Railroads
33
Boundaries
27
Geology
21
Society
19
Transportation
17
Planning and Cadastral
14
Administrative and political divisions
13
Aerial views
12
Harbors
12
Land use
8
Landowners
8
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8
Mining
8
Discovery and exploration
7
American Civil War
6
Environment
6
Structure
6
Canals
5
Cities and towns
5