Bartels, Julius,  1899-1964 <br/><br/>
Geomagnetic data indices K and C 1956 / 
by J. Bartels, A. Romana and J. Veldkamp 
 - Amsterdam :  North-Holland,  1959 
 - ix, 157 p. :  ill. ;  24 cm. 
 - International association of geomagnetism and aeronomy bulletin ;  no. 12 K .
<br/><br/> International association of geomagnetism and aeronomy formaly known as association of terrestrail magnetism and electricity 
<br/><br/><label>ISBN: </label> USD 2.25 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Magnetism<br/>Geomagnetism
<br/><br/><label>Dewey Class. No.: </label>538.74