TY  - BOOK
AU  - Keyfitz Nathan
AU  -  Flieger Wilhelm
TI  - World population :  An analysis of vital data.   
U1  - Y:5.1.N6s, K8 
PY  - 1968///
CY  - Chicago
PB  - University of Chicago Press       
N1  - Bibliography : P667-72
ER  -