@misc{indiciae05fe1318daf9,
  title = {Occurrence of enargite and wulfenite in ore deposits of northern Arkansas},
  author = {E.T. McKnight},
  year = {1935},
  doi = {10.2113/gsecongeo.30.1.61},
  url = {https://pubs.usgs.gov/publication/70207396},
  note = {Source identifier: 70207396}
}