@misc{indiciaecf6ada47467e,
  title = {A Pleistocene ice sheet in the northern Boulder Mountains, Jefferson, Powell, and Lewis and Clark Counties, Montana},
  author = {Edward Thompson Ruppel},
  year = {1962},
  doi = {10.3133/b1141g},
  url = {https://pubs.usgs.gov/publication/b1141G},
  note = {Source identifier: b1141G}
}