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Subject (Region)
- United States20,808
- Illinois3,314
- California3,008
- New York (State)2,892
- Great Britain2,428
- Germany2,274
- France2,035
- Michigan1,738
- Massachusetts1,475
- Canada1,378
- Pennsylvania1,359
- Ohio1,350
- Wisconsin1,107
- North Carolina1,068
- Indiana1,006
- India919
- Minnesota904
- Japan882
- Italy855
- Soviet Union847