TY  - BOOK
AU  - Cochran, William G
TI  - Samplilng techniques
SN  - 9971512718
U1  - 001.4222 
PY  - 1977///
CY  - New York
PB  - John Wiley and Sons ,Inc
KW  - Double sampling
KW  - Ratio estimators
KW  - Regression
KW  - Staratified sampling
ER  -