Fries, James F. <br/><br/>
Vitality and aging :  implications of the rectangular curve / 
by James F. Fries and Lawrence M. Crapo 
 - San Francisco :  W. H. Freeman,  1981 
 - 172 p. :  ill. ;  24 cm. 
<br/><br/>Includes index Bibliography: p 
<br/><br/><label>ISBN: </label>071671308X 0716713098  pbk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aging<br/>Longevity<br/>Vitality<br/>Vitalism