@misc{indiciae64de5ce71b84,
  title = {Characterization and conceptualization of groundwater flow systems},
  author = {Niel Plummer and W. E. Sanford and P. D. Glynn},
  year = {2013},
  url = {https://pubs.usgs.gov/publication/70046477},
  note = {Source identifier: 70046477}
}