TY  - DATA
AU  - Nathan Keyfitz; John A. Beekman
TI  - Demography Through Problems
SN  - 9781475718430
PY  - 1984///
PB  - Springer New York
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/978-1-4757-1843-0
ER  -