@misc{indiciaeea49a2a88a70,
  title = {Early Permian vertebrates from the Culter Formation of the Placerville area, Colorado, with a section on footprints from the Cutler Formation},
  author = {G.E. Lewis and P.P. Vaughn and Donald Baird},
  year = {1965},
  doi = {10.3133/pp503c},
  url = {https://pubs.usgs.gov/publication/pp503C},
  note = {Source identifier: pp503C}
}