TY  - RPRT
TI  - Automated solid-phase extraction of herbicides from water for gas chromatographic-mass spectrometric analysis
AU  - M. T. Meyer
AU  - M. S. Mills
AU  - E.M. Thurman
PY  - 1993
DO  - 10.1016/0021-9673(93)80353-a
UR  - https://pubs.usgs.gov/publication/70017789
ID  - 70017789
ER  -