TY  - RPRT
TI  - A workbook for preparing a district quality- assurance plan for water-quality activities
AU  - Terry L. Schertz
AU  - Carolyn J.O. Childress
AU  - Valerie J. Kelly
AU  - Michelle S. Boucher
AU  - Gary L. Pederson
PY  - 1998
DO  - 10.3133/ofr9898
UR  - https://pubs.usgs.gov/publication/ofr9898
ID  - ofr9898
ER  -