TY  - RPRT
TI  - Quality assurance requirements for water-quality laboratories providing analytical survices for the Water Resources Division of the U.S. Geological Survey
AU  - David E. Erdmann
PY  - 1991
DO  - 10.3133/ofr91222
UR  - https://pubs.usgs.gov/publication/ofr91222
ID  - ofr91222
ER  -