Forster, Colin. <br/><br/>
Economic opportunity and white American fertility ratios 1800-1860 / 
by Colin Forster and G.S.L. Tucker ; with the assistance of Helen Bridge. 
 - New Haven :  Yale University Press,  1972. 
 - ix, 121 p. : 
<br/><br/><label>ISBN: </label>0300014783 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertility, Human--United States.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Population.<br/>United States--Economic conditions--To 1865.
<br/><br/><label>Dewey Class. No.: </label>304.6320973  / Ec