Subject Region
United States
163
Pennsylvania
19
Great Britain
16
New York (State)
16
California
14
New York
14
Virginia
13
Italy
12
New York (N.Y.)
12
Asia
11
Texas
11
Egypt
10
Europe
10
New Jersey
10
Southern States
10
Greece
9
Illinois
9
Philadelphia (Pa.)
9
China
8
England
8
Australia
7
Canada
7
Maryland
7
North America
7
Oakland
7
Philadelphia
7
Washington (State)
7
Alabama
5
India
5
Ireland
5
Japan
5
Massachusetts
5
Michigan
5
Oakland (Calif.)
5
South Carolina
5
Arkansas
4
Florida
4
France
4
Gettysburg National Military Park (Pa.)
4
Iowa
4
Malaysia
4
Middle Atlantic States
4
Minnesota
4
Missouri
4
Rome
4
Silk Road
4
Singapore
4
South Africa
4
Washington (D.C.)
4
Alamo (San Antonio, Tex.)
3
more ...