Isthmus of Darien : map showing the route of Commander Prevost from Rancho no. 1 on the Savana River to Rancho no. 12 beyond Prevost river to which are added the surveys and sections of the isthmus / by Lionel Gisborne, esqr., c.e., 1854.Gisborne, Lionel1866?]"To accompany Report of Rear Admiral C.H. Davis, U.S.N., ordered by resolution of the Senate of the United States of March 19, 1866."In upper right margin: No. VIII.Includes 2 cross sectRelief shown by hachures.Shows Savana, Morti, and Sucubdi Rivers.cartographic