Spiegelman, Mortimer. <br/><br/>
Introduction to demography. 

 - [Chicago, IL] :  Society of Actuaries,  1955. 
 - Society of Actuaries' textbook .
<br/><br/>Bibliography: p. 258-292. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Demography.