TY  - BOOK
AU  - Spengler,Joseph John
AU  - Duncan,Otis Dudley
TI  - Demographic analysis: selected readings 
U1  - 304.601 
PY  - 1956/// [ printing 1963]
CY  - Glencoe, Ill.
PB  - Free Press
KW  - Population
N1  - Bibliography: p. 785-813
ER  -