TY - RPRT TI - Characterization of and temporal changes in groundwater quality of the Upper Black Squirrel Creek Basin, El Paso County, Colorado, 2018–20 AU - Zachary D. Kisfalusi AU - Nancy J. Bauch AU - Carleton R. Bern PY - 2022 DO - 10.3133/sir20225061 UR - https://pubs.usgs.gov/publication/sir20225061 ID - sir20225061 ER -