TY  - BOOK
AU  - Cochran, William Gemmell.
TI  - Sampling techniques
U1  - 311.21 COC 3rd,ed.
PY  - 1963///
CY  - Islamabad
PB  - National Book Foundation 
KW  - Sampling (Statistics)
N1  - Includes bibliographical references and index
ER  -