@misc{indiciae85f59c6ccda7,
  title = {Regional structure of the southeast Missouri and Illinois-Kentucky mineral districts},
  author = {Allen Van Heyl and M. R. Brock and J. L. Jolly and C. E. Wells},
  year = {1965},
  doi = {10.3133/b1202b},
  url = {https://pubs.usgs.gov/publication/b1202B},
  note = {Source identifier: b1202B}
}