General map of the American isthmuses : showing the various lines proposed for interoceanic communication / compiled by C.H. Davis ; drawn by Louis Waldecker.Davis, Charles Henry, 1807-18771867]"No. 1." in upper right margin."To accompany report by Rear Admiral C.H. Davis, U.S.N., ordered by resolution of the Senate of the United States of March 19, 1866."Relief shown by hachures.cartographic