Depths shown by soundings (in fathoms), isolines, and shading. At head of title: North America. "No. 942." "Washington, D.C., published Oct., 1885 at the Hydrographic Office, under the authority of the Secretary of the Navy. Extensive corrections Feb., 1910; Jan., 1917." "Small corrections from Notices to Mariners: '17-6, 13, 19 and from other sources: III '17."