Rowlands, Derek J. <br/><br/>
Understandinjg the electrocardiogram :  a new approach, section 1: the normal ECG / 
by Derek Rowlands. 
 - London :  Imperial Chemical Industries PLC,  c1981. 
 - 104 p. :  col. ill. ;  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrocardiogram.<br/>Heart Diseases--diagnosis.