Leridoon, Henri, ed. Menken, Jane, ed. <br/><br/>
Natural fertility  Patterns and determinants of natural fertility : Seminar on natural fertility 

 - Belgium  International union for the scientific study of population 
 - xv,556p.; 26cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertility - essays, lectures, addresses<br/>Natural fertility<br/>Nutritional status<br/>Senual abstinence