TY  - BOOK
AU  - Engle, Earl T. 
TI  - The problem of fertility : : proceedings of the conference on fertility held under the auspices of the National Committee on Maternal Health
U1  - 591.16 ENG  
PY  - 1946///.
CY  - New Jersey : 
PB  - Princeton University Press, 
KW  - Fertility
ER  -