TY  - BOOK
AU  - Smith,Thomas Lynn
AU  - Zopf,Paul E.
TI  - Demography: principles and methods 
SN  - 0882840339
PY  - 1976///
CY  - N.Y.
PB  - Alfred Pub. Co.
KW  - Demography
N1  - Includes bibliographies and indexes
ER  -