TY  - SER
AU  - Bongaarts, J.
TI  - The fertility impact of traditional and changing childspacing practices in tropical Africa
T2  - A.I.D. research & development abstracts ; 
PY  - 1981///
CY  - Washington-US : 
PB  - United States Agency for International Development, 
N1  - Artículo dentro de: Population-family planning; Sumarios de investigación
ER  -