TY  - BOOK
AU  - Keyfita, Nathan and Bookman, John A.
AU  - Bookman, John A. ; jt. auth.
TI  - Demography through problems
T2  - Problem books in Mathematics
U1  - 510.9 
PY  - 1984///
CY  - New York
PB  - Springer-Verlag
ER  -