TY  - BOOK
AU  - Oblinger Childress,Carolyn J.
TI  - Water-quality data-collection activities in Colorado and Ohio: phase 2 -evaluation of 1984 field and laboratory quality-assurance practices 
PY  - 1989///
CY  - Washington D.C
PB  - U.S Government Printing Office
N1  - PTSL
ER  -