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Subject (Region)
- United States356
- Outer space42
- Great Britain12
- California10
- Latin America10
- University of California, Davis10
- Indonesia9
- Italy8
- Europe6
- Florida6
- Russia (Federation)6
- Asia5
- China5
- India5
- Germany4
- Japan4
- Santa Clara Valley (Santa Clara County)4
- Santa Clara Valley (Santa Clara County, Calif.)4
- Brazil3
- Developing countries3