1. On the Devonian fossils of Canada West;Billings;Canadian Journal of Industry and Science,1861
2. Fifth annual report on the paleontology of the state of New York;Conrad;New York State Geological Survey Annual Report,1841
3. Lamellibranchiata II, descriptions and figures of the Dimyaria of the upper Helderberg, Hamilton, Portage and Chemung Groups;Hall;New York State Geological Survey, Paleontology (Natural History of New York),1885
4. Observations on the Silurian and Devonian Systems of the United States, with descriptions of new organic remains;Conrad;Journal of the Academy of Natural Sciences of Philadelphia,1842
5. Second annual report on the paleontological department of the survey [of New York];Conrad;New York Geological Survey Annual Report,1839