TY  - BOOK
AU  - Spengler,Joseph J.
AU  - Duncan,Otis Dudley
TI  - Population theory and policy: selected readings 
SN  - 0136871526
U1  - 301.3 
PY  - 1956///
CY  - Glencoe, Ill
PB  - Free Press
KW  - Population
KW  - Collections
N1  -  Includes bibliographical references
ER  -