Johnson, Ralph L. <br/><br/>
YMCA pool operations manual / 
Ralph L. Johnson 
 - Second edition 
 - 143 pages ;.  illustrations ;  23 cm 
<br/><br/><label>ISBN: </label>0873226569 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Swimming pools--Handbooks, manuals, etc.
<br/><br/><label>Dewey Class. No.: </label>363.7292