Supplement to the Fifth Annual Report of the United States Geological Survey of the Territories for 1871
Report on fossil flora. Conducted under authority of the Secretary of the Interior. List of annual reports, 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).