@misc{indiciaecf756e28ca58,
  title = {Pre-Wisconsin soil in the Rocky Mountain region; a progress report},
  author = {Charles B. Hunt and V.P. Sokoloff},
  year = {1950},
  doi = {10.3133/pp221g},
  url = {https://pubs.usgs.gov/publication/pp221G},
  note = {Source identifier: pp221G}
}