@misc{indiciae42001e9528f7,
  title = {Nickel deposits in the lower Copper River valley},
  author = {R. M. Overbeck},
  year = {1920},
  doi = {10.3133/b712c},
  url = {https://pubs.usgs.gov/publication/b712C},
  note = {Source identifier: b712C}
}