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Click on the map below to show a more detailed map (when available) or search for studies (when map not available).

Map Legend
Region Name Number of Studies
World [map] 227
North America 176
United States 160 [studies]
Alabama 14 [studies]
Arizona 15 [studies]
Arkansas 4 [studies]
California 22 [studies]
Colorado 13 [studies]
Connecticut 9 [studies]
Delaware 1 [studies]
District of Columbia 5 [studies]
Florida 17 [studies]
Georgia 19 [studies]
Hawaii 3 [studies]
Idaho 2 [studies]
Illinois 11 [studies]
Indiana 14 [studies]
Iowa 5 [studies]
Kansas 10 [studies]
Kentucky 9 [studies]
Louisiana 6 [studies]
Maryland 11 [studies]
Massachusetts 18 [studies]
Michigan 12 [studies]
Minnesota 8 [studies]
Mississippi 6 [studies]
Missouri 17 [studies]
Montana 4 [studies]
Nebraska 9 [studies]
Nevada 9 [studies]
New Jersey 7 [studies]
New Mexico 2 [studies]
New York 40 [studies]
North Carolina 19 [studies]
North Dakota 1 [studies]
Ohio 22 [studies]
Oklahoma 9 [studies]
Oregon 5 [studies]
Pennsylvania 25 [studies]
Rhode Island 5 [studies]
South Carolina 11 [studies]
South Dakota 2 [studies]
Tennessee 9 [studies]
Texas 26 [studies]
Utah 12 [studies]
Virginia 6 [studies]
Washington 8 [studies]
West Virginia 2 [studies]
Wisconsin 3 [studies]

Click on a [map] link to show a map of that region.

Click on a [studies] link to search within your current results for studies in that region. Use the back button to return to this list and try another region.

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.