Stewart, Frank Henderson   . <br/><br/>
Fundamentals of age-group systems /  
Frank Henderson Stewart. 
 - NewYork  :   Academic Press ,   1977. 
 - xiii,381 p :   ill.,maps,charts,graphs ;   23 cm .  
<br/><br/>Includes bibliogrphy and index 
<br/><br/><label>ISBN: </label> USD39.95 (Hbk) 
<br/><br/><label>Subjects--Index Terms: </label>AGE GROUP 
<br/><br/><label>Dewey Class. No.: </label>305.2  / STE/F