Say M.G.  <br/><br/>
Direct current machines  

 - London:  ELBS,  1985. 
 - x,396p.  ill.; 
<br/><br/>Includes Index  
<br/><br/><label>ISBN: </label>0273024566 
<br/><br/><label>LC Class. No.: </label>TK2611  / .Sa9 1985