@misc{indiciaee42d84eaea90,
  title = {Geologic map of the upper Holter Lake quadrangle, Lewis and Clark County, Montana},
  author = {G. D. Robinson and M. E. McCallum and William Henry Hays},
  year = {1969},
  doi = {10.3133/gq840},
  url = {https://pubs.usgs.gov/publication/gq840},
  note = {Source identifier: gq840}
}