57 x 47 cm., folded to 22 x 13 cm. Indicates routes of Capt. Ingalls, Col. Steptoe,and Lt. Mowrey, and shows camping grounds. Relief shown by hachures. Graphic scale given in geographical as well as statute miles. "Ackerman Lith. 319 Broadway, N.Y." Hand colored. Original publisher unknown, Series: House Ex. Doc. No. 1, 1st session, 34th Congress.