@misc{indiciae3e965190aaed,
  title = {Geologic map of the Nelson quadrangle, Lewis and Clark County, Montana},
  author = {Mitchell W. Reynolds and William H. Hays},
  year = {2003},
  doi = {10.3133/i2774},
  url = {https://pubs.usgs.gov/publication/i2774},
  note = {Source identifier: i2774}
}