Zalis, Edwin G. <br/><br/>
Understanding electrocardiography :  physiological and interpretive concepts / 
by Edwin G. Zalis and Mary H. Conover 
 - 3rd ed. 
 - St. Louis, Mo. :  C. V. Mosby,  1980 
 - 287 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0801656761 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrocardiography
<br/><br/><label>National Library of Medicine Call No.: </label>WG140  / .Z224 1972 9