TY  - BOOK
AU  - Smith T Lynn
AU  -  Zopf Paul E
TI  - Demography:  Principles and methods   
U1  - Y:5.73.N7, L0 
PY  - 1970///
CY  - Philadelphia
PB  - Davis          
KW  - Demography
N1  - Bibliography at the end of each chapter
ER  -