Marriott, Henry J. L.  1917- <br/><br/>
Practical electrocardiography 
by Henry J. L. Marriott. 
 - 5th edition. 
 - Baltimore:  Williams & Wilkins,  1972. 
 - 325 pages :  illustrations ;  23 cm. 
<br/><br/> 'Guide for rapid and easy estimation rate': ruler in pocket. 
<br/><br/><label>ISBN: </label>0683055720 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrocardiography