@misc{indiciaeaa7919419d96,
  title = {Zinc and lead deposits of northern Arkansas},
  author = {George I. Adams and A. H. Purdue and E. F. Burchard and E. O. Ulrich},
  year = {1904},
  doi = {10.3133/pp24},
  url = {https://pubs.usgs.gov/publication/pp24},
  note = {Source identifier: pp24}
}