U. S. National Resources Committee. <br/><br/>
The problems of a changing population :  report of the committee on population problems to the National Resources Committee May 1938 

 - Arno Press :  New York ,  1976 
 - 306 p. ; 29 cm. 
<br/><br/><label>ISBN: </label>0405079982 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Population