@misc{indiciae67be538d5abd,
  title = {Descriptive and comparative osteology of the oldest fossil squirrel Protosciurus (Rodentia: Sciuridae) / Smithsonian contributions to paleobiology — Illustration, Page 22},
  year = {1982},
  url = {https://www.biodiversitylibrary.org/page/58101770},
  note = {Source identifier: page-58101770}
}