1904 Hammond map of Japan, Korea & Manchuria

This map, "JAPAN, KOREA AND MANCHURIA", was published in 1904 by C.S. Hammond & Co., New York.

You can see three islands in the Japan Sea, Argonaut I., Dagelet I. and Hornet I. from west to east. Argonaut island was a phantom island of Ulleungdo and Dagelet island was true Ulleungdo. Hornet island was another name for Liancourt Rocks. These islands were not coloured whilst Oki islands and Tsushima were painted in red (Japan) and Cheju-do in orange (Korea), which may mean USA didn't know that Ulleungdo belong to Korea at that time. And it is certain that they didn't think that Liancourt Rocks belong to Korea in 1904, four years after the Korean Edict #41. This fact may support Japan's claim that Liancourt Rocks were terra nullius (ownerless island) in 1904 before Japan's incorporation of the rocks.

Broughton Bay was labeled as "Broughton Bay or Gulf of Korea"

Sea of Japan was labeled as "JAPAN SEA".

Argonaut island, Dagelet island and Liancourt Rocks were labeled as "ARGONAUT I.", "DAGELET I." and "HORNET I.".