@misc{indiciae3cba50a49329,
  title = {Preliminary geologic map of the Sentinel Peak NE Quadrangle, Montezuma County, Colorado},
  author = {E. B. Ekren and F. N. Houser},
  year = {1958},
  doi = {10.3133/tem1103},
  url = {https://pubs.usgs.gov/publication/tem1103},
  note = {Source identifier: tem1103}
}