TY  - BOOK
AU  - Cochran,Willam G., x
AU  - x
TI  - Sampling techniques: x
SN  - x 
U1  - 311.21/COS 
PY  - 1977///
CY  - New Delhi
PB  - Wiley
KW  - Sampling (Statistics)
KW  - Statistics
ER  -