@misc{indiciaeb9eaabea2bbf,
  title = {Groundwater quality, age, and susceptibility and vulnerability to nitrate contamination with linkages to land use and groundwater flow, Upper Black Squirrel Creek Basin, Colorado, 2013},
  author = {Tristan P. Wellman and Michael G. Rupert},
  year = {2016},
  doi = {10.3133/sir20165020},
  url = {https://pubs.usgs.gov/publication/sir20165020},
  note = {Source identifier: sir20165020}
}