@misc{indiciae2339417ee6b8,
  title = {Iron Hill (Powderhorn) carbonatite complex, Gunnison County, CO - A potential source of several uncommon mineral resources},
  author = {B. S. Van Gosen and H.A. Lowers},
  year = {2007},
  url = {https://pubs.usgs.gov/publication/70031531},
  note = {Source identifier: 70031531}
}