Triangulation by James Ferguson and Ferd. H. Gerdes, assistants ; the hydrography under the direction of George M. Bache, lieutenant U.S. Navy ; typography by F.H. Gerdes, assistant. Relief shown by hachures. Depths shown by contours and soundings. Covers Annapolis region including Severn River and adjacent part of Chesapeake Bay. Includes sailing information and 4 coastal panoramas.