Duffy, Edward J. <br/><br/>
Family social status and fertility  [microform] / 
Edward J.Duffy 
 - Ann Arbor, Mich. :  University Microfilms International,  1980 
 - 2 microfiches ;  11 x 15 cm. 
<br/><br/>Thesis (Ph.D.)-Duke University, 1980 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertility, Human--United States