Below are scans of a 1967 map of Japan and Korea, which was a map made by the American mapmaking company, Hammond. The map shows Liancourt Rocks (Dokdo/Takeshima) labeled as "Takeshima" and marks them as being Japanese territory. The story about the map was reported HERE, in the May 5th edition of the Japanese newspaper, "The San-in Chuo Shimpo."
According to the article, a Mr. Sugihara, who is a consultant on the "Takeshima issue" for Shimane Prefecture, explained, "In the US, Takeshima was recognized as Japanese territory around that period." Actually, the US government had told Korea in the 1950s that she considered Liancourt Rocks to be Japanese territory (see HERE), so the 1967 American map may have been a continued reflection of that belief.
Korea calls Liancourt Rocks "Dokdo" (獨島 - 독도) and has been forcibly occupying them since the 1950s, when Korean President Rhee Syngman unilaterally declared them Korean territory.