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Subject (Region)
- United States3,101
- Great Britain435
- Germany270
- California258
- Italy213
- Japan208
- Soviet Union189
- China178
- France174
- Developing countries156
- England142
- Canada105
- Florida101
- India100
- Germany (West)94
- Washington (State)93
- Europe89
- New York (State)88
- Texas78
- Netherlands74