00350nam a2200109Ia 4500082002500000100004100025245007500066260004800141300001300189500000500202700003300207  a304.6309034bF733.EO  aForster, Colin, and Tucker, G. S. L.  aEconomic opportunity and white American fertility ratios, 1800-1860.b  aNew HavenbNew Haven University Pressc1972  ax, 121p.  a  aTucker, G. S. L. ; jt. auth.