United Nations. <br/><br/>
Fertility levels and trends as assessed from twenty world fertility surveys. 

 - New York :  United Nations,  1983. 
<br/><br/> This study looks at levels and trends in fertility from a survey from twenty developing countries. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertility.<br/>Population size -- Population increase -- Family size//Developing countries/.--Population size -- Population increase -- Family size//Developing countries/.--Population size -- Population increase -- Family size//Developing countries/.