TY - RPRT TI - Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of organophosphate pesticides in bottom sediment by gas chromatography with flame photometric detection AU - Virendra Kumar Jha AU - Duane S. Wydoski PY - 2003 DO - 10.3133/wri024222 UR - https://pubs.usgs.gov/publication/wri024222 ID - wri024222 ER -