Bartels, Julius <br/><br/>
Geomagnetism /  
by Sidney Chapman and Julius Bartels 
 - Oxford :   Clarendon Press,   1940 
 - 2 v. ;   24 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GEOLOGIA<br/>MAGNETISMO TERRESTRE
<br/><br/><label>Universal Decimal Class. No.: </label>55