Clayton, Albert. E. <br/><br/>
Performance and design of DC machines / 

 - 3rd ed. 
 - London :  Pitman Publishing,  1959. 
 - xx, 516 p. :  ill. ;  21 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0273401866 
<br/><br/><label>LC Class. No.: </label>472 
<br/><br/><label>Dewey Class. No.: </label>621.3132  / CLA