Contributions to the fossil flora of the western territories ... - Lesquereux, Leo, 1806-1889. (Washington, Govt. print. off., 1874)
pt. I. The Cretaceous flora.--pt. II. The Tertiary flora.--pt. III. The Cretaceous and Tertiary floras.
At head of title: United States Geological survey of the territories.
Keywords: Paleobotany -- Cretaceous; Paleobotany -- Tertiary; Plants, Fossil -- West (U.S.)