TY  - BOOK
AU  - Hansen, Morris. H.
AU  - Hurwitz, William N.
TI  - Sample Survey Methods and theory # Sample Survey Methods and theory -vol 1 Methods and applications: Vol 1 Methods and applications
U1  - 519.52 
PY  - 1956/// # 1953
CY  - New York
PB  - Chapman & Hall
ER  -