Lang, Johannes Georg. <br/><br/>
The Magnetic Field 
Von Johannes G. Lang. 
 - Berlin :  Siemens-Aktiengesellschaft,  1974. 
 - 64 p.  :  ill col.  ;  21 cm. 
 - PU ;  no 7 .
<br/><br/><label>ISBN: </label>3800940078 (pbk) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Magnetism.