Keyfitz, Nathan <br/><br/>
Demography through problems/ 
Nathan Keyfitz and John A. Beekman 
 - New York :  Spinger-Verlag,  1984 
 - viii, 141 p. :  ill. ;  24 cm. 
 - Problem books in mathematics  .
<br/><br/> Includes Index 
<br/><br/>Includes bibliographical references   
<br/><br/><label>ISBN: </label>0387908366 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Demography-problems- exercises