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Subject (Region)
- United States20,885
- Illinois3,318
- California3,036
- New York (State)2,905
- Great Britain2,451
- Germany2,307
- France2,061
- Michigan1,744
- Massachusetts1,481
- Canada1,388
- Pennsylvania1,365
- Ohio1,350
- Wisconsin1,112
- North Carolina1,069
- Indiana1,006
- India935
- Minnesota905
- Japan904
- Italy861
- Soviet Union854