Forster, Colin, and Tucker, G. S. L. <br/><br/>
Economic opportunity and white American fertility ratios, 1800-1860.   

 - New Haven  New Haven University Press  1972 
 - x, 121p. 
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>304.6309034  / F733.EO