@misc{indiciae09b49a515f5f,
  title = {Preliminary geologic map of the Howardsville 7.5-minute quadrangle, San Juan and Hinsdale counties, Colorado},
  author = {R. G. Luedke and W. S. Burbank},
  year = {1996},
  doi = {10.3133/ofr96278},
  url = {https://pubs.usgs.gov/publication/ofr96278},
  note = {Source identifier: ofr96278}
}