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Subject (Region)
- Great Britain[remove]33
- Poland[remove]33
- Germany (to 1949; 1990- )23
- France22
- Italy19
- Japan15
- Soviet Union (1922-1991)15
- Czechoslovakia14
- Hungary13
- Netherlands13
- Austria12
- Belgium12
- Europe12
- Turkey12
- Yugoslavia12
- Greece11
- Portugal11
- Romania11
- Spain10
- Nicaragua9