TY  - RPRT
TI  - Quality-assurance plan for the Pilot National Water-Quality Assessment Program
AU  - H. C. Mattraw
AU  - William G. Wilber
AU  - William M. Alley
PY  - 1989
DO  - 10.3133/ofr88726
UR  - https://pubs.usgs.gov/publication/ofr88726
ID  - ofr88726
ER  -