@misc{indiciae757bf35f2331,
  title = {Precambrian basement map of the north Mid-Continent, U.S.A.: A digital representation of the 1990 P.K. Sims map},
  author = {Connie L. Dicken and Shana G. Pimley and William F. Cannon},
  year = {2001},
  doi = {10.3133/ofr0121},
  url = {https://pubs.usgs.gov/publication/ofr0121},
  note = {Source identifier: ofr0121}
}