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Subject (Region)
- United States28
- Canada18
- Latin America9
- Developing countries7
- European Union countries6
- Caribbean Area4
- Africa2
- Europe, Eastern2
- Alberta1
- Bartlesville1
- Brazil1
- Czech Republic1
- El Salvador1
- Europe, Central1
- European Union countries . 090::EC 1.2:En881
- Gaza Strip1
- Mexican-American Border Region1
- Nevada1
- Oklahoma1
- Salvador1