"Permian vertebrates from West Virginia."; "Tilton, John Littlefield, b. 1863."; "Geology, Stratigraphic--Permian.", "Vertebrates, Fossil--West Virginia."; "Tilton, John Littlefield, b. 1863."; "1926"; "Journal article reprint from: Bulletin of the Geological Society of America, v.37 (1926:June 30)."; ""; "P1175"; "pec"; "Geology, Stratigraphic--Permian.", "Vertebrates, Fossil--West Virginia."; "14256"; .