@misc{indiciae66ec1dc050b9,
  title = {Minor epigenetic, diagenetic, and syngenetic sulfide, fluorite, and barite occurrences in the central United States},
  author = {A. V. Heyl},
  year = {1968},
  doi = {10.2113/gsecongeo.63.6.585},
  url = {https://pubs.usgs.gov/publication/70221366},
  note = {Source identifier: 70221366}
}