@misc{indiciae6796fa62631d,
  title = {Photogeologic and reconnaissance geologic map of the Horton Quadrangle, Custer and Rosebud counties, Montana},
  author = {R. B. Colton and J.L. Klockenbrink and M. A. Grout and E.L. Heffern},
  year = {1983},
  doi = {10.3133/mf1662},
  url = {https://pubs.usgs.gov/publication/mf1662},
  note = {Source identifier: mf1662}
}