Volume II: The vertebrata of the Cretaceous formations of the West
Report of the United States Geological Survey of the Territories consists of XIII Volumes; Volume IV not published. Ferdinand Vandeveer Hayden is the United States geologist in-charge of this series. Other contributor: National Academy of Sciences. List of monographs, with contents of each, and author and subject index may be found in "Catalogue and index of the publications of the Hayden, King, Powell, and Wheeler surveys" by L.F. Schmeckebier. 1904. (U.S. Geological Survey. Bulletin no. 222).