@misc{indiciae6e7f323f3c0b,
  title = {Preliminary map of pingos in National Petroleum Reserve in Alaska},
  author = {John P. Galloway and L. David Carter},
  year = {1978},
  doi = {10.3133/ofr78795},
  url = {https://pubs.usgs.gov/publication/ofr78795},
  note = {Source identifier: ofr78795}
}