- E-bookThe Adductor Muscles of the Jaw In Some Primitive ReptilesRichard C. Fox
- E-bookTwo New Pelycosaurs from the Lower Permian of OklahomaRichard C. Fox
- E-bookThe Adductor Muscles of the Jaw In Some Primitive ReptilesRichard C. Fox
- E-bookThe Adductor Muscles of the Jaw In Some Primitive ReptilesRichard C. Fox
- E-bookTwo New Pelycosaurs from the Lower Permian of OklahomaRichard C. Fox
- E-bookTwo New Pelycosaurs from the Lower Permian of OklahomaRichard C. Fox