@misc{indiciae83a0b54d7fa1,
  title = {Precambrian basement map of the northern Midcontinent, U.S.A.},
  year = {1985},
  doi = {10.3133/ofr85604},
  url = {https://pubs.usgs.gov/publication/ofr85604},
  note = {Source identifier: ofr85604}
}