Roberts, Larry S. <br/><br/>
The underwater world of sport diving instructor's manual. 

 - St.Louis :  Mosy-Year Book,  1991 
 - 37 P. ;  illus 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Diving.<br/>Underwater Exploration.
<br/><br/><label>Dewey Class. No.: </label>627  / R643U.