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International Geophysical Year

the 18-month period from July 1, 1957, to Dec 31, 1958, during which a number of nations agreed to cooperate in a geophysical research programme IGY
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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  • This is the parade marking the international geophysical year, is it not?

    Martian V.F.W. G.L. Vandenburg

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