TY  - BOOK
TI  - Levels and trends of fertility throughout the world, 1950-1970
T2  - Population studies 
U1  - 304.6/32 
PY  - 1977///
CY  - New York
PB  - United Nations
KW  - Fertility, Human
N1  - "United Nations publication. Sales no. E.77.XIII.2."; Includes bibliographical references
ER  -