@misc{indiciae7d25ef5ee34e,
  title = {Geology and underground waters of southern Minnesota},
  author = {C.W. Hall and O. E. Meinzer and Myron Leslie Fuller},
  year = {1911},
  doi = {10.3133/wsp256},
  url = {https://pubs.usgs.gov/publication/wsp256},
  note = {Source identifier: wsp256}
}