Vadedekamp, J and Siebert, M <br/><br/>
Geomagnetic data 1966 indices K and C I.A.G.A Bulletin No. 1241 
J. Vadedekamp and M. Siebert 
 - Paris  IUGG Publications  1969 
 - xvi, 118p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetic Data
<br/><br/><label>Universal Decimal Class. No.: </label>083.550.38  / IAGA-12U1