@misc{indiciaea90efe20a93d,
  title = {A primer on ground water},
  author = {Helene L. Baldwin and C. L. McGuinness},
  year = {1963},
  doi = {10.3133/7000056},
  url = {https://pubs.usgs.gov/publication/7000056},
  note = {Source identifier: 7000056}
}