Romana, A <br/><br/>
Geomagnetic data 1965 rapid variations (IAGA Bulletin No.12) 
A. Romana 
 - Paris  IUGG Publications  1969 
 - vii, 88p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetic Data
<br/><br/><label>Universal Decimal Class. No.: </label>083.550.38  / IAGA-12T2