Walker, Morton. <br/><br/>
Sport diving :  the instructional guide to skin & scuba / 
Mort Walker. 
 - Chicago :  H. Regnery,  c1977. 
 - xvii, 315 p. :  ill. 
<br/><br/><label>ISBN: </label>0809281767 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Skin diving.