@misc{indiciae3ba49e78d5af,
  title = {Permafrost},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1973},
  doi = {10.3133/7000077},
  url = {https://pubs.usgs.gov/publication/7000077},
  note = {Source identifier: 7000077}
}