This map was attached to an official book made by the Office of Public Information, "Korea: Her History and Culture", which was published in 1954.
This book was written in English to make world countries understand Korea's history and culture including how Korea endeavoured to gain independence from 'wicked' Japan. It fully explains how Yi Sun-shin fought against troops of Toyotomi Hideyoshi and how Queen Ming was assassinnated by Japanese. But it didn't refer to Dokdo or Liancourt Rocks at all.
I wonder why they didn't write about Dokdo if they really considered that it was robbed by 'wicked' Japan.
They mentioned islands which were discovered by Westerners;
"But it was in the middle of
the nineteenth century that the Wsterners came to Korea in considerable numbers.
In addtion to Catholic priests, quite a number of French, British and Russian
survey-ships and whalers cruised the waters surrounding the peninsula, and many
Korean islands, ports, and coastal towns became known to the West as were shown
on their marine charts. Mulshom island, for instance, was called "Boisee",
Kohmun island, "Port Hamilton," and Ulnung (sic), "Dagalet.(sic)" Cheju island
had previously been named "Quelpart" by the Dutch."
Still, there is no mentioning of Dokdo or Liancourt Rocks.
The year 1954 was the year Korea's illegal occupation of Liancourt Rocks began.
Rhee Syngman drew the Syngman Line two years previously (1952) and they insisted that Liancourt Rocks belonged to Korea.
Then, why the book didn't mention Liancourt Rocks at all?
It maybe because they knew that they were not the right owner of Dokdo (Liancourt Rocks).
But the Korean propaganda "Dokdo is ours" began after then maybe in order to make Korean people believe the myth of Dokdo.......Thye told their people that "Dokdo is ours" but they couldn't say the same phrase to the outer world.
BTW, to follow is a map of Korea made by C.S. Hammond & Co. (New York). It was included in the "Military Maps of All Theaters of Operation" which was published in the 1950's. This map was made during almost the same period as the above book and map because this map included the Military Demarcation Line at 38 degree which was set on March 27th 1953. You may notice that there is no Dokdo (Liancourt Rocks) in tha map. The world knew that Dokdo (Liancourt Rocks) didn't belong to Korea in around 1954 when Korea occupied Dokdo illegally.