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Subject (Region)
- Pennsylvania[remove]85
- Philadelphia34
- Philadelphia (Pa.)27
- New York7
- United States7
- Springmill5
- Susquehanna River (Maryland/New York/Pennsylvania)5
- Illinois4
- Ohio River4
- Pittsburgh4
- West Virginia4
- Allegheny River (New York/Pennsylvania)3
- Georgia3
- Monongahela River (Pennsylvania/West Virginia)3
- New Mexico Territory (1850-1912)3
- Pittsburgh (Pa.)3
- Tennessee3
- Tennessee River3
- Alabama2
- Ashland County, Ohio2