Paulus Roetter Sketchbook On Pines And Cactus

On the Geology and Natural History of the Upper Missouri ?being the Substance of a Report Made to Lieut. G.K. Warren, T.E. U.S.A. /By Dr. F.V. Hayden

Synopsis of the Cactaceae of the Territory of the United States and Adjacent Regions /by George Engelmann

Sketch of the Botany of Dr. A. Wislizenus's Expedition ?missouri to Santa Fe, Chihuahua, Parras, Saltillo, Monterey and Matamoros

Revision of the Genus Pinus, and Description of Pinus Elliottii. by Dr. George Engelmann