Subject Region
United States
34
Taiwan
4
China
3
Great Britain
3
India
2
Korea
2
Korea (South)
2
Antarctica
1
Asia
1
Australia
1
England
1
Hong Kong
1
Iceland
1
Indochina
1
Iran
1
Israel
1
Japan
1
Louisiana
1
Oklahoma
1
Outer space
1
Pakistan
1
Puerto Rico
1
Saint Lawrence Seaway
1
Soviet Union
1
Spain
1
Switzerland
1