Gregory, John Martin. <br/><br/>
Alternating currents / 
by J. M. Gregory 
 - London :  Methuen Educational,  1971. 
 - 66 p. :  illus.  21 cm. 
 - Methuen studies in science .
<br/><br/> Distributed in the U.S.A. by Barnes and Noble. 
<br/><br/>Includes index. Bibliography: p. 63. 
<br/><br/><label>ISBN: </label>0423842706  0423799304 (non-net) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric currents, Alternating.
<br/><br/><label>Dewey Class. No.: </label>537.63  / GRA 1971