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Subject (Region)
- United States86
- Italy12
- California7
- Colorado7
- Massachusetts7
- Alaska5
- Arizona5
- New Mexico5
- New York (State)4
- West (U.S.)4
- Georgetown-Silver Plume Historic District3
- Georgetown-Silver Plume Historic District (Colo.)3
- Georgia3
- Pennsylvania3
- Salem Maritime National Historic Site (Mass.)3
- Salem Region3
- Texas3
- United States Highway 663
- Arabia Mountain National Heritage Area (Ga.)2
- Buffalo Bayou National Heritage Area (Houston, Tex.)2