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Subject (Region)
- Communist countries1,905
- Europe, Eastern284
- United States243
- Former communist countries215
- Soviet Union195
- Developing countries72
- China71
- Europe56
- Poland55
- Soviet Union (1922-1991)55
- Hungary37
- Germany (East)36
- Europe, Central34
- Czechoslovakia26
- Cuba25
- Former Soviet republics24
- Romania19
- Great Britain18
- Russia (Federation)16
- Asia15