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Subject (Region)
- United States33
- Pennsylvania6
- Chicago5
- Chicago (Ill.)5
- Cook County (Ill.)5
- Illinois5
- Massachusetts5
- Philadelphia5
- Philadelphia (Pa.)5
- California4
- Philadelphia County (Pa.)4
- San Francisco (Calif.)4
- Cambridge3
- Cambridge (Mass.)3
- Middlesex County (Mass.)3
- Philadelphia County3
- San Francisco Bay Area3
- San Francisco Bay Area (Calif.)3
- Washington (D.C.)3
- Boston (Mass.)2