TY  - BOOK
AU  - Forster, Colin.
TI  - Economic opportunity and white American fertility ratios 1800-1860
SN  - 0300014783
U1  - 304.6320973 
PY  - 1972///
CY  - New Haven
PB  - Yale University Press
KW  - Fertility, Human
KW  - United States
KW  - Population
KW  - Economic conditions
KW  - To 1865
ER  -