@misc{indiciaea910992336ee,
  title = {Bibliography for update and revision of U.S.G.S. Bulletin 1114, Minerals of Colorado -- a 100 year record, by Edwin B. Eckel, Part D - Disk (Wordstar; 1.44 mb, 3 1/2 in.)},
  author = {Donley S. Collins and Robert R. Cobban and Eugene E. Foord and Jack A. Murphy},
  year = {1989},
  doi = {10.3133/ofr89206d},
  url = {https://pubs.usgs.gov/publication/ofr89206D},
  note = {Source identifier: ofr89206D}
}