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30971 Studies found for: standard AND United States

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Map Legend
Region Name Number of Studies
World 30,971
Africa [map] 467
Central America [map] 496
East Asia [map] 1,093
Japan 525 [studies]
Europe [map] 2,639
Middle East [map] 855
North America 30,522
Canada [map] 1,980 [studies]
Mexico 494 [studies]
United States [map] 30,471 [studies]
North Asia [map] 793
Pacifica [map] 1,097
South America [map] 832
South Asia [map] 315
Southeast Asia [map] 460

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Studies with multiple locations are included in each region containing locations.