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Paleontology — Oligocene — Audiobooks
A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull
by Edwin C. (Edwin Carter) Galbreath
Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan
by William A. (William Alvin) Clemens