TY  - RPRT
TI  - Quality-assurance results for routine water analyses in US Geological Survey laboratories, water year 1997
AU  - Amy S. Ludtke
AU  - Mark T. Woodworth
AU  - Philip S. Marsh
PY  - 1999
DO  - 10.3133/wri994057
UR  - https://pubs.usgs.gov/publication/wri994057
ID  - wri994057
ER  -