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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] 65
North America 44
United States 44 [studies]
Alabama 2 [studies]
Arizona 7 [studies]
Arkansas 1 [studies]
California 19 [studies]
Colorado 5 [studies]
Connecticut 1 [studies]
Florida 13 [studies]
Georgia 5 [studies]
Idaho 1 [studies]
Illinois 6 [studies]
Indiana 5 [studies]
Kansas 2 [studies]
Kentucky 4 [studies]
Louisiana 4 [studies]
Maryland 2 [studies]
Michigan 5 [studies]
Minnesota 2 [studies]
Missouri 3 [studies]
Nebraska 1 [studies]
Nevada 1 [studies]
New Jersey 3 [studies]
New Mexico 1 [studies]
New York 5 [studies]
North Carolina 8 [studies]
North Dakota 2 [studies]
Ohio 3 [studies]
Oklahoma 5 [studies]
Oregon 3 [studies]
Pennsylvania 10 [studies]
South Carolina 4 [studies]
Tennessee 1 [studies]
Texas 14 [studies]
Utah 5 [studies]
Virginia 7 [studies]
Washington 5 [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.