Sullivan, W. (1961). Assault on the unknown: The international geophysical year. New York: McGraw-Hill Book Company.
Παραπομπή Chicago StyleSullivan, Walter. Assault On the Unknown: The International Geophysical Year. New York: McGraw-Hill Book Company, 1961.
Παραπομπή MLASullivan, Walter. Assault On the Unknown: The International Geophysical Year. New York: McGraw-Hill Book Company, 1961.
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