@misc{indiciae8a23a69d73a7,
  title = {Brachiopoda of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming},
  author = {Mackenzie Gordon},
  year = {1975},
  doi = {10.3133/pp848d},
  url = {https://pubs.usgs.gov/publication/pp848D},
  note = {Source identifier: pp848D}
}