@misc{indiciaeecfc140d2452,
  title = {Gypsiferous deposits on Sheep Mountain, Alaska},
  author = {R.A. Eckhart},
  year = {1953},
  doi = {10.3133/b989c},
  url = {https://pubs.usgs.gov/publication/b989C},
  note = {Source identifier: b989C}
}