1. Graptolite faunas of the Marathon region, West Texas;BERRY;Univ. Texas Pub,1960
2. Conodonts from the Prairie du Chien (Lower Ordovician) beds of the Upper Mississippi Valley;FURNISH;J. Paleont,1938
3. The Oslobreen Series, Upper Hecla Hoek of Ny Friesland, Spitsbergen;GOBBETT;Geol. Mag,1960
4. Ordovician conodonts of the Marathon Basin, Texas;GRAVES;Tech. Ser. Sch. Mines Metall. Univ. Mo,1941
5. New Conodonts from Joins (Ordovician) Formation of Oklahoma;HARRIS;Okla. Geol. Notes,1962