Drawn by W.B. Hyde Julius Bien & Co. Lith. NY. from the Atlas to Accompamy the Official Records of the Union and Confederate Armies. 1861-1865. print. 1891-1895 sheet: 18.25" x 28.875" (two parts, each: 16.5" x 13.75") hand-colored engraving
"'Essayons' Topographical Map of California, Nevada, Oregon and part of Idaho. Prepared from Field Surveys and other Reliable Data Under the Direction of Bvt. Lt. Col. R.S. Williamson, Corps of Engravers, U.S.A. Drawn by W.B. Hyde. 1867."