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Subject (Region)
- United States127
- Developing countries55
- Canada20
- Latin America14
- Europe, Eastern8
- Caribbean Area7
- European Union countries7
- Africa5
- Europe4
- Japan4
- Pacific Area4
- Pays en voie de développement3
- Soviet Union3
- European Economic Community2
- European Economic Community countries2
- Iran2
- Middle East2
- Países subdesarrollados2
- América latina1
- Andes1