@misc{indiciae3e2a4bec37e9,
  title = {Images of the U.S. Geological Survey, 1879-1979},
  author = {E. L. Yochelson and C.M. Nelson},
  year = {1979},
  doi = {10.3133/70039523},
  url = {https://pubs.usgs.gov/publication/70039523},
  note = {Source identifier: 70039523}
}