@misc{indiciaecdeb07f74fa0,
  title = {Precambrian basement map of the Springfield 1 degree by 2 degrees Quadrangle, Missouri},
  author = {E. B. Kisvarsanyi},
  year = {1987},
  doi = {10.3133/mf1830e},
  url = {https://pubs.usgs.gov/publication/mf1830E},
  note = {Source identifier: mf1830E}
}