@misc{indiciae6dcab2855a09,
  title = {A reconnaissance of the gypsum deposits of California},
  author = {Frank Lee Hess and George Steiger},
  year = {1910},
  doi = {10.3133/b413},
  url = {https://pubs.usgs.gov/publication/b413},
  note = {Source identifier: b413}
}