@misc{indiciae4c18ed84959f,
  title = {Map showing distribution of permafrost in the Fairbanks D-2 NW Quadrangle, Alaska},
  author = {Troy L. Pewe and John W. Bell},
  year = {1975},
  doi = {10.3133/mf668a},
  url = {https://pubs.usgs.gov/publication/mf668A},
  note = {Source identifier: mf668A}
}