Subject Region
China
6
United States
5
France
3
Hungary
3
Sweden
3
England
2
Israel
2
Norway
2
Poland
2
Russia (Federation)
2
Argentina
1
Australia
1
Baltic States
1
Canada
1
Denmark
1
Detroit (Mich.)
1
Estonia
1
Germany (East)
1
Great Plains
1
Greece
1
Guangzhou
1
Hiroshima-shi (Japan)
1
Italy
1
Latin America
1
Latvia
1
Leningradskai͡a oblastʹ
1
Mexico
1
Naples
1
Navarre (Spain)
1
New Zealand
1
Normandy
1
Romania
1
Scotland
1
South America
1