TY  - BOOK
ED  - United Nations.
ED  - United Nation.
TI  - Sample surveys of current interest: fourth report 
T2  - Statistical papers/ Statistics Division, United Nation
U1  - 311.2 
PY  - 1952///
CY  - New York
PB  - United Nations
KW  - Sampling (Statistics)
KW  - Periodicals
KW  - Statistics
ER  -