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Biographical Memoirs: Volume 87
1861 Descriptions of new species of Crinoidea from the Carboniferous Rocks of the Mississippi Valley. J. Boston Soc. Nat. Hist. 7:251-328.
1862 With J. D. Whitney. Geological Survey of the State of Wisconsin. Madison.
1865 Figures and Descriptions of Canadian Organic Remains. Decade II. Graptolites of the Quebec Group. Montreal: Geological Survey of Canada.
1871 Geological Survey of the State of Wisconsin, 1859-1863: Palaeontology. Albany.
1875 On the relations of the Niagara and lower Helderberg Formations and their geographical distribution in the United States and Canada. Twenty-Seventh Annual Report of the State Museum of New York. Albany: State Museum of New York.
With R. P. Whitfield. Geological Survey of Ohio, II, pt. 2, Palaeontology, Description of Silurian Fossils. Columbus.
1877 With R. P. Whitfield. In U.S. Geological Explorations of the Fortieth Parallel, IV, pt. 2, Palaeontology, ed. C. King. Washington.
1883 Contributions to the geological history of the North American continent. Proc. Am. Assoc. Adv. Sci. 31:24-69.