@misc{indiciaefb2d97ee8120,
  title = {Metalliferous black shales and related ore deposits; proceedings, 1989 United States Working Group meeting, International Geological Correlation Program Project 254},
  author = {Richard I. Grauch and Holly L.O. Huyck},
  year = {1990},
  doi = {10.3133/cir1058},
  url = {https://pubs.usgs.gov/publication/cir1058},
  note = {Source identifier: cir1058}
}