IGY : year of discovery : the story of the International Geophysical Year /
Chapman, Sydney.
IGY : year of discovery : the story of the International Geophysical Year / by Sydney Chapman. - Ann Arbor : University of Michigan Press, [c1959]. - 111 p. : ill.
International Geophysical Year, 1957-1958.
IGY : year of discovery : the story of the International Geophysical Year / by Sydney Chapman. - Ann Arbor : University of Michigan Press, [c1959]. - 111 p. : ill.
International Geophysical Year, 1957-1958.