@misc{indiciaedc8ce0b76468,
  title = {The educational series of rock specimens, collected and distributed by the United States Geological Survey},
  author = {Joseph Silas Diller},
  year = {1898},
  doi = {10.3133/b150},
  url = {https://pubs.usgs.gov/publication/b150},
  note = {Source identifier: b150}
}