Volume VI: Contributions to the fossil flora of the Western Territories, Part I: The Cretaceous flora
Report of the United States Geological Survey of the Territories consists of XIII Volumes; Volume IV not published. Volume VI contains Part I of Contributions to the fossil flora of the Western Territories; Volumes VII and VIII contain Parts II and III respectively. Ferdinand Vandeveer Hayden is the United States geologist in-charge of this series. 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).