@misc{indiciae21daa8704eaa,
  title = {Frost action and vegetation patterns on Seward Peninsula, Alaska},
  author = {D.M. Hopkins and R.S. Sigafoos},
  year = {1951},
  doi = {10.3133/b974c},
  url = {https://pubs.usgs.gov/publication/b974C},
  note = {Source identifier: b974C}
}