TY  - BOOK
AU  -  Keyfitz, Nathan
TI  - Population: facts and methods of demography
SN  - 0716709317
U1  - 301.3207 
PY  - 1971///
CY  - San Francisco
PB  - W.H. Freeman
KW  -  Demography -- Mathematical models. Population -- Statistics. Demography
ER  -