TY  - BOOK
AU  - Cochran, William G. (William Gemmell), 1909-1980 
TI  - Sampling techniques
SN  - 0471029394
U1  - 001.4'222 COC 1977 3rd ed.
PY  - 1977///
CY  - Jhon Wiley & Sons
PB  - New York
ER  -