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Subject (Region)
- United States24,491
- Canada353
- Washington (D.C.)333
- District of Columbia320
- Europe317
- Great Britain231
- Japan204
- France197
- Mexico173
- China130
- Soviet Union130
- Pennsylvania121
- Massachusetts120
- Texas119
- Kansas117
- New York (State)111
- Louisiana107
- Latin America105
- Virginia100
- California99