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Subject (Region)
- United States21
- Saudi Arabia6
- Middle East5
- Developing countries4
- Venezuela4
- Africa2
- Arab countries2
- Russia (Federation)2
- California1
- China1
- Daqing (Heilongjiang Sheng)1
- Developed countries1
- Equatorial Guinea1
- Europe1
- European Economic Community countries1
- Galicia (Poland and Ukraine)1
- Great Britain1
- Guinea, Gulf of1
- Nigeria1
- Permskiĭ kraĭ1