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Subject
Structure
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22
Transportation
6
Buildings
5
Bridges
4
Hydrography
4
Inland Waters
4
Location
4
Rivers
4
Roads
4
Streets
4
Trails
4
Utilities and Communication
4
Railroads
3
Historic sites
2
National Register of Historic Places
2
Boundaries
1
Cables, Submarine
1
Dams
1
Electric power-plants
1
Environment
1