Armstrong, Michael L. <br/><br/>
Electrocardiograms :  a systematic method of reading them / 
by Michael L. Armstrong 
 - 4th ed. 
 - Bristol :  John Wright,  1978 
 - 189 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0723604622 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrocardiography