@misc{indiciae377652666e0b,
  title = {Ground-water appraisal of the Pineland Sands area, central Minnesota},
  author = {J. O. Helgesen},
  year = {1977},
  doi = {10.3133/wri77102},
  url = {https://pubs.usgs.gov/publication/wri77102},
  note = {Source identifier: wri77102}
}