from surveys under the direction of Bvt. Brig. Gen. N. Michler, Maj. of Engineers, by command of Bvt. Maj. Genl. A.A. Humphreys, Brig. Genl. & Chief of Engineers ; surveyed and drawn by Maj: J.E. Weyss ; assisted by F. Theilkuhl, J. Strasser & G. Thompson ; photolith. by the N.Y. Lithographing, Engraving & Printing Co., Julius Bien, Supt