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Subject
Real property
30
Railroads
13
Geology
9
Landowners
8
Harbors
5
Aerial views
4
Botanical gardens
4
Mines
4
Mining
4
Administrative and political divisions
3
Canals
3
Copper mines
2
Election districts
2
Land use
2
Mineral resources
2
Rivers
2
School districts
2
Schools
2
Steamboats
2
Street-railroads
2