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Subject (Region)
- United States4,163
- Washington (D.C.)141
- France90
- Kansas67
- West United States51
- Bleeding Kansas and the Enduring Struggle for Freedom National Heritage Area48
- District of Columbia42
- South America41
- Old Northwest38
- Maine33
- Great Britain31
- Texas31
- Canada29
- New York (State)29
- Africa27
- Massachusetts27
- Waldo Patent24
- Connecticut21
- Missouri19
- Caribbean Area18