TY  - BOOK
AU  - Stycos J M
TI  - Family and fertility in Puerto Rico: a study of the lower income group
U1  - 304.63 
PY  - 1955///
CY  - New York
PB  - Columbia University Press
KW  - Fecundity
KW  - Fertility
KW  - Marriage
KW  - Puerto Rico
KW  - Vital statistics
ER  -