@misc{indiciaecea68b04b276,
  title = {Gastropoda, Cephalopoda, and Trilobita of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming},
  author = {Mackenzie Gordon and Ellis Leon Yochelson},
  year = {1975},
  doi = {10.3133/pp848f},
  url = {https://pubs.usgs.gov/publication/pp848F},
  note = {Source identifier: pp848F}
}