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. From Chinese I.M.C. Service and Japanese surveys between 1904 and 1909 (with extensive corrections by the Lower Liao River Conservancy Engineers, 1... U. S. Navy Hydrographic Office,.