@misc{indiciaec35147edf9ac,
  title = {Glacier observations, Glacier National Park, Montana, 1957 and 1958},
  author = {Arthur Johnson},
  year = {1959},
  doi = {10.3133/ofr5971},
  url = {https://pubs.usgs.gov/publication/ofr5971},
  note = {Source identifier: ofr5971}
}