TY  - BOOK
AU  - Hansen, Morris H
AU  - Hurwitz, William N
AU  - Madow, William G
TI  - Sample survey methods and theory V.1 Methods and applications-V.2 Theory
CY  - New York
KW  - Random sampling
KW  - Sample surveys
KW  - Sampling - statistics
KW  - Statistics of sampling
ER  -