@misc{indiciae08d10a98f017,
  title = {Quartz crystal deposits of western Arkansas},
  author = {A.E.J. Engel and R.H. Wilpolt and J. P. Albers and E. W. Heinrich},
  year = {1943},
  doi = {10.3133/ofr4326},
  url = {https://pubs.usgs.gov/publication/ofr4326},
  note = {Source identifier: ofr4326}
}