@misc{indiciae5f2676c66adf,
  title = {The quartz crystal deposits of western Arkansas},
  author = {A.E.J. Engel},
  year = {1946},
  doi = {10.2113/gsecongeo.41.6.598},
  url = {https://pubs.usgs.gov/publication/70214509},
  note = {Source identifier: 70214509}
}