Region
20th century
1
California
2
Californie
1
Cuba
1
Detroit
1
Detroit (Mich.)
1
EE. UU
1
Estados Unidos
1
États-Unis
États-Unis (Sud)
2
Liberia
1
Michigan
1
Minnesota
1
New York
1
New York (État)
1
New York (N.Y.)
1
New York (State)
2
North Philadelphia
1
North Philadelphia (Philadelphia, Pa.)
1
Northwest, Pacific
1
Ohio River Valley
1
Ohio, Vallée de l'
1
Pacific Northwest
1
Palo Alto
1
Palo Alto (Calif.)
1
Pennsylvania
4
Pennsylvanie
2
Peru
1
Pérou
1
Philadelphia
2
Reston
1
Reston (Va.)
1
San Francisco
1
Southern States
2
Stanford
1
Stanford (Calif.)
1
USA
1
United States
35
United States, Pennsylvania
1
Verenigde Staten
1
Virginia
1