Armstrong, Michael L. <br/><br/>
Electrocardiograms : a systematic method of reading them / 
by Michael L. Armstrong. 
 - 4th ed. 
 - Bristol :  Wright,  1978 
 - ix, 189 p. :  ill. 
<br/><br/><label>ISBN: </label>0723604622 9780723604624 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrocardiography
<br/><br/><label>National Library of Medicine Call No.: </label>WG 140.3  / .A76 1978