TY  - BOOK
AU  - Keyfitz,Nathan
AU  - Beeckman,John A.
TI  - Demography through problems
T2  - Problem books in mathematics
SN  - 0387908366
AV  - HB850.3 K47
PY  - 1984///]
CY  - New York
PB  - Springer Verlag
KW  - Demografía
KW  - Problemas, ejercicios, etc
ER  -