@misc{indiciaeb975bf37c55e,
  title = {Pingos in central Alaska},
  author = {G.W. Holmes and D.M. Hopkins and H.L. Foster},
  year = {1968},
  doi = {10.3133/b1241h},
  url = {https://pubs.usgs.gov/publication/b1241H},
  note = {Source identifier: b1241H}
}