The temporal region of the Permian reptile Diadectes / Everett Claire Olson --

v.10:no.9(1950)

Parallelism in the evolution of the Permian reptilian faunas of the Old and New Worlds / Everett C. Olson.

v.37:no.13(1955)

Cacops (Amphibia : Labyrinthodontia) from the Fort Sill Locality, Lower Permian of Oklahoma / John R. Bolt --.

v.37:no.3(1977)

Oligocene sedimentation, stratigraphy, paleoecology and paleoclimatology in the big Badlands of South Dakota [by] John Clark, James R. Beerbower [and] Kenneth K. Kietzke.

v.5(1967)

New or little known titanotheres from the lower Uintah formations, with notes on the stratigraphy and distribution of fossils / By Elmer S. Riggs -- Oliver Cummings Farrington --

v.4:no.2(1912)

A trematopsid skull from the Lower Permian, and analysis of some characters of the dissorophoid (Amphibia, Labyrinthodontia) otic notch / John R. Bolt.

v.30:no.3(1974)

Ectoprocta (Bryozoa) from the Permian Kaibab Formation, Grand Canyon National Park, Arizona / Frank K. McKinney --.

n.s. no.13(1983)

Two new species of Broiliellus (Amphibians) from the Permian of Texas / Robert E. De Mar --

v.16:no.5(1967)

Longiscitula houghae; a new genus of dissorophid amphibian from the Permian of Texas / Robert E. DeMar, Asst. Professor of Geology, University of Illinois, Chicago Circle Campus.

v.16:no.2(1966)

Geochronology, stratigraphy, and typology / John Andrew Wilson --.

v.33:no.11(1975)

New and little known genera and species of vertebrates from the Lower Permian of Oklahoma / [by] Everett C. Olson -- [Patricia M. Williams, editor]

v.18:no.3(1970)

The stratigraphy of the Devonian Holland Quarry shale of Ohio / J. Ernest Carman --

v.14:no.1(1960)

Fauna of the Vale and Choza : Trimerorhachis : including a revision of prevale species / Everett Claire Olson --

v.10:no.21(1955)

A strange arthropod from the Mazon Creek of Illinois and the Trans Permo-Triassic Merostomoidea (Trilobitoidea) / [by] Frederick R. Schram --

v.20:no.6(1971)