United States, Hydrographic Office. Compiled from various Government Charts to 1935. Depths shown by soundings and tints, relief by form lines and spot heights. 1935 magnetic variatio... U. S. Navy Hydrographic Office,.
United States, Hydrographic Office. Compiled from the latest information. Depths shown by soundings, relief by form lines and spot heights. 1935 magnetic variation compass. Shows dept... U. S. Navy Hydrographic Office,.