Combs, Jerry Walker, 1913- <br/><br/>
Human fertility in Puerto Rico / Jerry Walker Combs. 

 - Ann Arbor, Mich.  University Microfilms  1954. 
 - 265 p.  ill. 
 - [Doctoral dissertation series. Publication no. : 10, 259] .
<br/><br/>Thesis Columbia University. 
<br/><br/>Bibliography : p. 222-227. 
<br/><br/><br/>Photostat reproduction. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertility--Human.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Population.