Erickson, Ralph D. <br/><br/>
Discover the underwater world :  the complete guide to the art and science of skin and SCUBA diving / 
by Ralph D. Erickson. 
 - Santa Ana, Calif. :  U.S. Divers,  c1972. 
 - [vii], 132 p. :  ill. (some col.), charts ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Skin diving.<br/>Scuba diving.
<br/><br/><label>Dewey Class. No.: </label>797.2