@misc{indiciae7f56ab4f6a83,
  title = {Contributions to economic geology (short papers and preliminary reports), 1923-1924, Part I, Metals and nonmetals except fuels. Observations on the rich silver ores of Aspen Colorado},
  author = {E.S. Bastin},
  year = {1925},
  doi = {10.3133/b750c},
  url = {https://pubs.usgs.gov/publication/b750C},
  note = {Source identifier: b750C}
}