TY  - BOOK
AU  - Cochran,William Gemmell
TI  - Sampling techniques
T2  - Wiley series in probability and mathematical statistics
SN  - 047116240X
U1  - 001.4222 
PY  - 1977///
CY  - New York
PB  - John Wiley, 
KW  - MUESTREO (ESTADISTICA)
ER  -