Junō--Shiyatoru / Rikuchi Sokuryōbu, Sanbō Honbu.Shōwa 18 [1943]昭和 18 [1943]"Kōkūzu gunji himitsu (senchi ni arite wa 'bugaihi' to su) ""Sanbyakuman-bun-no-ichi Han Taih"三百万分一汎太平洋輿地圖十六號航空圖素圖."Publication date of 1943 infered by date for the magnetic declination information on map.Relief shown by contours and gradient tints.cartographic