00508nam a2200157Ia 4500 190328s9999||||xx |||||||||||||| ||und|| 59-9733 NITIL NITIL 21st 551.1 C466I Chapman, Sydney IGY year of discovery: the story of the international geophysical year Sydney Chapman Ann Arbor University of Michigan Press 1959 108p: ill Geophysics; Earth Sciences; Cosmic rays; Atmosphere BKS 32646 32646