Region
United States
10
États-Unis
4
Pennsylvania
2
Philadelphia
2
Philadelphia (Pa.)
2
Allemagne
1
Boston
1
Boston (Mass.)
1
California
1
Düsseldorf
1
Düsseldorf (Germany)
1
Germany
1
Maryland
1
Massachusetts
1
New York
1
New York (N.Y.)
1
New York (State)
1
Palo Alto
1
Palo Alto (Calif.)
1
Pennsylvanie
1
Philadelphie
1
Reston
1
Reston (Va.)
1
Soviet Union
1
Stanford
1
Stanford (Calif.)
1
URSS
1
Verenigde Staten
1
Virginia
1