@misc{indiciae22f8c955614a,
  title = {Map showing availability of data for selected deep drill holes in the northern Midcontinent, U.S.A.},
  author = {D. N. Mugel},
  year = {1986},
  doi = {10.3133/mf1835a},
  url = {https://pubs.usgs.gov/publication/mf1835A},
  note = {Source identifier: mf1835A}
}