Langsdorf,A.S. <br/><br/>
Principles of Direct Current Machines / 
A.S.Langsdorf 
 - 6th.ed. 
 - New York :  1959  McGraw Hill, 
 - 363p. :  ill. ;  23cm 
<br/><br/><label>Dewey Class. No.: </label>621.3132 LAN