@misc{indiciaeddedb5c07ae5,
  title = {Sphalerite in coals from southeastern Iowa, Missouri, and southeastern Kansas},
  author = {Joseph R. Hatch and M.J. Avcin and W.K. Wedge and L. L. Brady},
  year = {1976},
  doi = {10.3133/ofr76796},
  url = {https://pubs.usgs.gov/publication/ofr76796},
  note = {Source identifier: ofr76796}
}