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Subject (Region)
- Great Britain[remove]526
- Australia524
- Canada134
- New Zealand122
- France91
- Germany (to 1949; 1990- )61
- United States58
- India57
- China55
- South Africa55
- Italy51
- Japan48
- Belgium47
- Netherlands41
- Mexico39
- Switzerland37
- Europe34
- Russia (to 1921)33
- Africa32
- Norway32