TY - RPRT TI - Spatiotemporal variations in copper, arsenic, cadmium, and zinc concentrations in surface water, fine-grained bed sediment, and aquatic macroinvertebrates in the upper Clark Fork Basin, western Montana—A 20-year synthesis, 1996–2016 AU - Sara L. Caldwell Eldridge AU - Michelle I. Hornberger PY - 2023 DO - 10.3133/sir20235070 UR - https://pubs.usgs.gov/publication/sir20235070 ID - sir20235070 ER -