@misc{indiciae82ca6ec98dbe,
  title = {Contributions to economic geology, 1920, Part I, Metals and nonmetals except fuels--Potash deposits in Spain},
  author = {H. S. Gale},
  year = {1921},
  doi = {10.3133/b715a},
  url = {https://pubs.usgs.gov/publication/b715A},
  note = {Source identifier: b715A}
}