TY - CHAP A1 - Cohen, B. T1 - Fertility levels, differentials, and trends Y1 - 1993 A3 - Foote, K.A. A3 - Hill, K.H. A3 - Martin, L.G. T2 - Demographic change in sub-Saharan Africa CY - Washington PB - National Academy Press SP - 8 EP - -67 ER -