@misc{indiciae58aba3be3d06,
  title = {North American Paleozoic land snails, with a summary of other Paleozoic nonmarine snails},
  author = {Alan Solem and Ellis Leon Yochelson},
  year = {1979},
  doi = {10.3133/pp1072},
  url = {https://pubs.usgs.gov/publication/pp1072},
  note = {Source identifier: pp1072}
}