@misc{indiciae853d5c95b39c,
  title = {Manganese deposits of the Caddo Gap and De Queen quadrangles, Arkansas},
  author = {H.D. Miser},
  year = {1918},
  doi = {10.3133/b660c},
  url = {https://pubs.usgs.gov/publication/b660C},
  note = {Source identifier: b660C}
}