TY  - RPRT
TI  - Determination of trace levels of herbicides and their degradation products in surface and ground waters by gas chromatography/ion-trap mass spectrometry
AU  - W. E. Pereira
AU  - C.E. Rostad
AU  - T.J. Leiker
PY  - 1990
DO  - 10.1016/s0003-2670(00)80480-8
UR  - https://pubs.usgs.gov/publication/70016252
ID  - 70016252
ER  -