Palæontology of the upper Missouri: a report upon collections made principally by the expeditions under command of Lieut. G. K. Warren, U.S. Top. Engrs., in 1855 and 1856. Invertebrates.
University of California Libraries (archive.org)
Evidence reported by ian frederick-rothwell for item palontologyofu00meekrich on March 15, 2007: no visible notice of copyright; stated date is 1865.