@misc{indiciae77f85722c45c,
  title = {Geology of the Robertson, Humdinger, and Robert E. gold mines, southwestern Oregon},
  author = {P. J. Shenon},
  year = {1933},
  doi = {10.3133/b830b},
  url = {https://pubs.usgs.gov/publication/b830B},
  note = {Source identifier: b830B}
}