Assault on the unknown : the International Geophysical Year /
Sullivan, Walter.
Assault on the unknown : the International Geophysical Year / Walter Sullivan. - New York : McGraw-Hill, 1961. - xiv, 460 p. : ill.
International Geophysical Year, 1957-1958.
Assault on the unknown : the International Geophysical Year / Walter Sullivan. - New York : McGraw-Hill, 1961. - xiv, 460 p. : ill.
International Geophysical Year, 1957-1958.