TY  - RPRT
TI  - Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of methylene blue active substances by spectrophotometry
AU  - Mark R. Burkhardt
AU  - Pete J. Cinotto
AU  - Galen W. Frahm
AU  - Mark T. Woodworth
AU  - Jeffrey W. Pritt
PY  - 1995
DO  - 10.3133/ofr95189
UR  - https://pubs.usgs.gov/publication/ofr95189
ID  - ofr95189
ER  -