The Arroyo Formation (Leonardian, Lower Permian) and its vertebrate fossilsEverett Claire Olson · First published 1989Open the Tome
Dinosaurs past and presentSylvia Massey Czerkas, Everett Claire Olson · First published 1987Open the Tome
Late Permian terrestrial vertebrates, U.S.A. and U.S.S.REverett Claire Olson · First published 1962Open the Tome
The family Diadectidae and its bearing on the classification of reptilesEverett Claire Olson · First published 1947Open the Tome
The dorsal axial musculature of certain primitive Permian tetrapods..Everett Claire Olson · First published 1936Open the Tome
The dorsal axial skeleton and inferred musculature of certain primitive Permian TetrapodsEverett Claire Olson · First published 1935Open the Tome
