TY  - BOOK
AU  - Spengler, Joseph J.
AU  - Duncan, Otis Dudley,
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 2
PY  - 1956///];copyright 195646
CY  - Glencoe, Ill
PB  - Free Press
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Population
N1  - Bibliography: p. 785-813. Bibliographical footnotes; 5
ER  -