Balder, A. P.  <br/><br/>
Sport diving :  the complete manual for skin and scuba divers / 
A. P. Balder. 
 - Revised and updated edition of 1968. 
 - New York :  Collier Books,  1978. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0020280404 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Skin diving.<br/>Scuba diving.