TY  - BOOK
AU  - Smith, T Lynn
AU  - Zopf, Paul E
TI  - Demography: principles and methods
SN  - 0-8036-7920-3
U1  - 312.0973 21st
PY  - 1970///
CY  - Philadelphia
PB  - F A Davis
KW  - Demography-America; Population; Fertility-America; Mortality-America
ER  -