Official Map Of The Territory Of Arizona Compiled from Surveys, Reconnaissances and other Sources. By E.A. Eckhoff And P. Riecker, Civil Engineers, 1880. Drawn by Eckhoff & Riecker. The Graphic Co. Photo-Lith. 39 & 41 Park Place, N.Y. Entered ... 1879, by Emil Eckhoff and Paul Riecker ... Washington, D.C.