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International Geophysical Year

noun

  1. 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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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This is the parade marking the International Geophysical Year, is it not?

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