Annals of the international geophysical year  v. 3 : the ionosphere; part 1 : ionospheric vertical soundings 
edited by W. J. G. Beynon and G. M. Brown 
 - London  Pergamon Press  1957 
 -  diagrams; illus; tables 
 - Annals of the International Geophysical Year .
<br/><br/><label>ISBN: </label>978-1483226552 
<br/><br/><label>Subjects--Topical Terms: </label><br/>International Geophysical Year
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / BLE