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Creator
France
4
Germany (West)
3
Feltz, Herman R. (Herman Ray), 1926-
2
Soviet Union
2
United States
2
Argentina
1
Baldwin, Helene Louise, 1920-
1
Ben-Arieh, Yehoshua
1
Finland
1
Geological Survey (U.S.)
1
Germany
1
Italy
1
Luxembourg
1
McGuinness, C. L. (Charles Lee), 1914-
1
Mexico
1
Poland
1
Uruguay
1