@misc{indiciaebcb0e94b9d6c,
  title = {Sentinel Peak NW quadrangle, Montezuma County, Colorado},
  author = {E. B. Ekren and F. N. Houser},
  year = {1957},
  doi = {10.3133/mf132},
  url = {https://pubs.usgs.gov/publication/mf132},
  note = {Source identifier: mf132}
}