@misc{indiciaee8c6ad8adf43,
  title = {Mineral resources of the San Juan primitive area, Colorado, with a section on iron resources in the Irving Formation},
  author = {Thomas August Steven and L.J. Schmitt and M.J. Sheridan and F. E. Williams and Jacob Eugene Gair and Harry Klemic},
  year = {1969},
  doi = {10.3133/b1261f},
  url = {https://pubs.usgs.gov/publication/b1261F},
  note = {Source identifier: b1261F}
}