TY  - GEN
AU  - 
AU  - SINGER, S. Fred (Ed.)
TI  - Is There an Optimum Level of Population?
U1  - 304.6/SIN;B 
PY  - 1971///
CY  - NEW YORK
PB  - McGraw-Hill Book Company
N1  - POPULATION EDUCATION; POPULATION GROWTH AND POVERTY; POPULATION POLICY
ER  -