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Subject (Region)
- Germany652
- United States573
- Europe520
- Great Britain260
- Italy222
- France168
- China101
- Poland97
- Japan93
- Greece78
- Austria69
- Netherlands60
- Germany (West)49
- Philippines46
- Soviet Union43
- Soviet Union (1922-1991)39
- Australia36
- Canada36
- Turkey35
- Czechoslovakia34