TY  - GEN
AU  - 
AU  - HANSEN, Morris H., et al
TI  - Sample Survey methods and theory
U1  - 001.433;1/HAN;A 
PY  - 1953///
CY  - NEW YORK
PB  - John Wiley & Sons Inc.
N1  - FUNDAMENTAL THEROY; SAMPLING & REGRESSION; VARIANCES
ER  -