Johnston, H. F. <br/><br/>
Geomagnetic indices K and C, 1955 
H. F. Johnston                                              
 - Washington  1948 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetic Indices
<br/><br/><label>Universal Decimal Class. No.: </label>083.550.38  / IAGA-12J