1. The Cambrian of the upper Mississippi Valley, Part II, Trilobita; Saukiinae;Ulrich;Bulletin of the Public Museum of the City of Milwaukee,1933
2. The Cambrian of the upper Mississippi Valley, Part I, Trilobita; Dikelocephalinae and Osceolinae;Ulrich;Bulletin of the Public Museum of the City of Milwaukee,1930
3. Raasch G. O. 1939. Cambrian Merostomata. Geological Society of America Special Paper 19, 146 p.
4. The Devonian of Wisconsin. Part 1, Lamellibranchiata;Pohl;Bulletin of the Public Museum of the City of Milwaukee,1929b
5. Middle Devonian pelecypods of Wisconsin and their bearing on correlation;Pohl;Washington Academy of Science,1929a