@misc{indiciaeec7cd18903df,
  title = {The Purcell Lava, Glacier National Park, Montana},
  author = {R. G. McGimsey},
  year = {1985},
  doi = {10.3133/ofr85543},
  url = {https://pubs.usgs.gov/publication/ofr85543},
  note = {Source identifier: ofr85543}
}