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Map Legend
Region Name Number of Studies
World [map] 199
North America 161
United States 158 [studies]
Alabama 11 [studies]
Arizona 2 [studies]
Arkansas 3 [studies]
California 35 [studies]
Colorado 8 [studies]
Connecticut 17 [studies]
District of Columbia 2 [studies]
Florida 25 [studies]
Georgia 6 [studies]
Illinois 5 [studies]
Indiana 2 [studies]
Kansas 13 [studies]
Kentucky 5 [studies]
Louisiana 4 [studies]
Maine 2 [studies]
Maryland 25 [studies]
Massachusetts 24 [studies]
Michigan 3 [studies]
Minnesota 2 [studies]
Mississippi 6 [studies]
Missouri 6 [studies]
Nevada 2 [studies]
New Hampshire 2 [studies]
New Jersey 8 [studies]
New Mexico 5 [studies]
New York 35 [studies]
North Carolina 8 [studies]
Ohio 19 [studies]
Oklahoma 6 [studies]
Oregon 14 [studies]
Pennsylvania 20 [studies]
Rhode Island 7 [studies]
South Carolina 11 [studies]
Tennessee 5 [studies]
Texas 17 [studies]
Utah 16 [studies]
Vermont 6 [studies]
Virginia 6 [studies]
Washington 18 [studies]
West Virginia 1 [studies]
Wisconsin 6 [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.