URSI handbook of ionogram interpretation and reduction of the world wide soundings committe 
edited by W. R. Piggott and K. Rawer     
 - Amsterdam  Elsevier  1961 
 - xi, 192p. 
 - International scientific radio union URSI monographs .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Ionogram<br/>Ionosphere<br/>Ionospheric stations
<br/><br/><label>Universal Decimal Class. No.: </label>551.510.5  / URSI