@misc{indiciae7f41df2d2498,
  title = {Eleventh Annual report of the Director of the United States Geological Survey, Part 1-Geology: 1889-1890},
  author = {J. W. Powell},
  year = {1891},
  doi = {10.3133/ar11\_1},
  url = {https://pubs.usgs.gov/publication/ar11\_1},
  note = {Source identifier: ar11\_1}
}