TY  - GEN
AU  - Cochran, William G.
TI  - Sampling techniques
SN  - 047116240X
U1  - 001.4222 
PY  - 1977///
CY  - New York
PB  - John Wiley & Sons
KW  - Knowledge
KW  - Research
KW  - Collection of data
KW  - Statistical methods
KW  - Research methods
ER  -