Possibly a draft prepared for reproduction by Hydrographic Office, U.S. Navy. Relief shown by contours and spot heights. Depths shown by soundings. A seal "Hydrographic Office, U.S. Navy"; and "Emergency reproduction of Japanese charts"--On a piece of paper pasted on map. "From H.O.N.M.: from other sources: Printed by H.O., Aug '44 [date handwritten]"; also "Soundings and heights in meters"; and "Fathoms to meters" (table)--Printed ...
Japan. Kaigunshō. Suirobu - United States. Hydrographic Office
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