@misc{indiciaec876e54dd905,
  title = {Map showing location of Purcell lava in Glacier National Park, Montana},
  author = {Robert G. McGimsey},
  year = {1984},
  doi = {10.3133/ofr84853},
  url = {https://pubs.usgs.gov/publication/ofr84853},
  note = {Source identifier: ofr84853}
}