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
Meek, F. B. (Fielding Bradford), 1817-1876; Hayden, F. V. (Ferdinand Vandeveer), 1829-1887; Warren, Gouverneur Kemble, 1830-1882