Subject Region
United States
383
California
6
Virginia
6
Massachusetts
4
New York (State)
4
Pennsylvania
4
Canada
3
Maryland
3
Arizona
2
Connecticut
2
Michigan
2
Minnesota
2
Missouri
2
North Carolina
2
Tennessee
2
Texas
2
Washington (D.C.)
2
Appalachian Region
1
Colorado
1
Estados Unidos
1
Florida
1
Illinois
1
Indiana
1
Kansas
1
Louisiana
1
New Jersey
1
Oklahoma
1
Washington (State)
1