Map of the Gadsden Purchase : Sonora and portions of New Mexico Chihuahua & California / by Herman Ehrenberg C.E.; from his private notes and those of Colonel Gray Maj: Heintzelman, Lieut: Parks and others ; the Yaqui, Mayo and Fuerte valleys are by A. Fleury Millitary [sic] Eng: of Sonora | Collections | The Huntington