Eldridge's new chart of Boston Harbor : compiled from the latest surveys / engraved by G.W. Boynton.Eldridge, George, 1821-18791891"Entered according to Act of Congress in the year 1865 by Samuel T. Cushing in the Clerk's Office of the District Court of the District of Massachusetts." outsIncludes "Sailing Directions".Relief shown by hachures. Depths shown by soundings and shading.cartographic