@misc{indiciae51ce8d157ab7,
  title = {Oblique map of the northern Sierra Nevada, California, showing location of gold-bearing areas},
  author = {T. R. Alpha and F. C. W. Dodge and J. D. Bliss},
  year = {1987},
  doi = {10.3133/mf1981},
  url = {https://pubs.usgs.gov/publication/mf1981},
  note = {Source identifier: mf1981}
}