Bartels, Julius <br/><br/>
Collection of geomagnetic planetary indices Kp and derived daily indices, Ap and Cp, for the years 1932 to 1961 
Julius Bartels                                              
 - Amsterdam  North-Holland  1962 
 - vii, 188p. 
 - IAGA bulletin; no. 18 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetism<br/>Geomagnetism - observations
<br/><br/><label>Universal Decimal Class. No.: </label>083:550.30  / IAGA-18