TY  - BOOK
AU  - Hill,George W.
AU  - Farrar,Martha S.
TI  - Impact of non-sampling errors on weighed tract survey indicators / 
U1  - 001.433 
PY  - 1977///
CY  - Washington D.C. : 
PB  - US Department of Agriculture, 
KW  - Sampling
KW  - Survey
ER  -