@misc{indiciae41c245cd8e8f,
  title = {Mafic-ultramafic igneous rocks and associated carbonatites of the Gem Park Complex, Custer and Fremont Counties, Colorado},
  author = {Raymond Laurence Parker and William N. Sharp},
  year = {1970},
  doi = {10.3133/pp649},
  url = {https://pubs.usgs.gov/publication/pp649},
  note = {Source identifier: pp649}
}