Subject Region
United States
400
England
130
Great Britain
128
India
49
France
42
Soviet Union
34
China
32
Europe
30
New York (State)
28
Mexico
25
Spain
23
Latin America
22
Virginia
22
Massachusetts
21
Southern States
21
New York
20
New York (N.Y.)
20
Pennsylvania
19
Rome
19
Germany
18
Russia
17
California
16
London (England)
16
Egypt
15
Africa
13
Brazil
13
Canada
13
London
13
North Carolina
11
Europe, Eastern
10
Italy
10
Russia (Federation)
10
Chicago (Ill.)
9
Chile
9
Ireland
9
Peru
9
Boston
8
Caribbean Area
8
Cuba
8
Greece
8
Japan
8
Philadelphia
8
Poland
8
Argentina
7
Developing countries
7
Illinois
7
Jamaica
7
Korea
7
North America
7
America
6
more ...