TY  - BOOK
AU  - Heer David M
TI  - Readings on population
T2  - Prentice Hall readings in modern sociology series. Ed by Alex Inkeles
U1  - Y:5z7, K8 
PY  - 1968///
CY  - Englewood
PB  - Cliffs NJ Prentice-Hall        
ER  -