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31311 Studies found for: standard AND United States

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Map Legend
Region Name Number of Studies
World [map] 31,311
North America 30,849
United States 30,798 [studies]
Alabama 1,836 [studies]
Alaska 200 [studies]
Arizona 2,244 [studies]
Arkansas 965 [studies]
California 7,258 [studies]
Colorado 2,402 [studies]
Connecticut 1,783 [studies]
Delaware 487 [studies]
District of Columbia 1,233 [studies]
Florida 4,574 [studies]
Georgia 2,839 [studies]
Hawaii 404 [studies]
Idaho 596 [studies]
Illinois 3,592 [studies]
Indiana 1,853 [studies]
Iowa 1,133 [studies]
Kansas 1,199 [studies]
Kentucky 1,491 [studies]
Louisiana 1,411 [studies]
Maine 447 [studies]
Maryland 3,837 [studies]
Massachusetts 4,068 [studies]
Michigan 3,003 [studies]
Minnesota 2,687 [studies]
Mississippi 642 [studies]
Missouri 2,934 [studies]
Montana 451 [studies]
Nebraska 1,094 [studies]
Nevada 869 [studies]
New Hampshire 589 [studies]
New Jersey 2,276 [studies]
New Mexico 670 [studies]
New York 6,143 [studies]
North Carolina 4,034 [studies]
North Dakota 381 [studies]
Ohio 4,307 [studies]
Oklahoma 1,244 [studies]
Oregon 1,675 [studies]
Pennsylvania 4,759 [studies]
Rhode Island 789 [studies]
South Carolina 1,876 [studies]
South Dakota 447 [studies]
Tennessee 2,666 [studies]
Texas 5,823 [studies]
Utah 1,477 [studies]
Vermont 404 [studies]
Virginia 2,209 [studies]
Washington 2,496 [studies]
West Virginia 521 [studies]
Wisconsin 1,776 [studies]
Wyoming 108 [studies]

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Studies with no locations are not included in the counts or on the map.

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