.
There are many evidences which Korea use Sea of Japan. Korea distorts the name of Sea of Japan is Colonial and expansionism name. but it is obvious that Korean claim is distorture. They did use Sea of Japan often, it is ofcourse it was before Korea be annexed in 1910.
The description of Chosun Jiji朝鮮地誌, edit and published by Education editor Bureau学部編纂局 on 1895.
Chosun is located on the eastern part of Asia , faced with Sea of Japan on the Southeast, west with Yellow sea, north with River Abnok and Duman鴨緑豆満.
朝鮮は亜細亜州の東端に在り東南は日本海に面し、西は黄海に臨み、北は鴨緑豆満二江・・・・
1895.萬国略史 学部編纂局 "Briefly World history" by Korea education department （Daehan imperial）
巻一 第一遍総論 第二章
Volume 1 Section 1 General information Chapter2 P8-9
海陸 Sea and Continent
海X大洋X一部X陸地XXXXXXXXXX
日本X満州間X
日本海ーXXX欧羅巴亜細亜阿弗利加X中間地中海ー
Sea is the part of Ocean and.................
Between Manchuria and Japan called Japan Sea.
巻一 第一遍総論 第二章 第九章 支那
Volume 1 Chapter 9 China P81
地界X東南X日本海X支那海X濱Xseinann X昆倫
The width of Chinese territory are Southwest between
Japan sea and (East)China sea
日本
太平洋西北隅X有X五大島X多数X小
島XXXX北X北海道X宗谷海峡X千島X又
？里海峡XXX界XX西北X日本海X隣X、X
西隅X朝鮮海峡X隔XX朝鮮X相對XX東南
一面XX太平洋XX
Daehanjiji大韓地誌,also published by Education editor Bureau学部編纂局 from 1899-1906.
Chosun(Korea) locates on the eastern part of Asia, at NorthEast of China, between Sea of Japan and Yellow Sea, Bolhae. It is peninsula country. ………….
East part facing with Sea of Japan, West with Yellwow sea, south with Sea of Japan…………………..
朝鮮は亜細亜州の東端に在り支那の東北部XXX日本海X黄海渤海間X突出半島国
（中略）東X日本海X界XX西は黄海X濱XX南X日本海X黄海X挑XX東南X一海峡X隔XX日本対馬島
Above those two famous Korean textbook also uses Sea of Japan. It is not only textbook which use Sea of Japan but also many variety of Great Korean Imperial’s official document and Newspaper in Korea. It is because Sea of Japan had already been defacto standard at that time so they use Sea of Japan in various documents: check here ( By Nidanosuke).
Geography text called 中等万國地誌 （Middle school world geography) describes "Sea of Japan"(日本海） in 1902.
But..there are another minor case Korea use another name as follows,
In 1904. .The Koryo middle era five province map高麗中期以後五道両界圖, they said Blue Sea蒼海.
1904 高麗中期以後五道両界圖
1906/1907.國語讀本 學部 編 (Korean National Language textbook editted by Korea education department)
1906（光部１０） and 1907（光武11） 巻三 第五課 江原道 （1906：19 1907：Vol3-23）
Volume 3 Lesson 5 Kanwondo.
Sea of Japan:日本海 （Sea of Japan)
1907.國語讀本 學部 編 (Korean National Language textbook editted by Korea education department)
巻八 第二課 清国 （12.17）
Volume 8. Lesson 2 Qing dynasty (China)
East China Sea :東海 （East Sea)
Yellow Sea:黄海（Yellow Sea)
巻八 第四課 満州
Volume 8 Lesson 4 Manchuria
P12(17）
Sea of Japan：日本海（Sea of Japan)
Yellow Sea：黄海（Yellow Sea)
1907.幼年必讀釋義 教師用 玄采 編
Page 4 第三課 大韓位置 Page 4 Lesson 3 Location of Daehan imperial
Sea of Japan: 日本海（Sea of Japan）
Broughton bay:朝鮮海（Joseon sea)
Yellow sea: 黄海（Yellow sea)
Strait of Korea:朝鮮海峡（Joseon strait)
（*Joseom means Tyo-sean (Korea))
1907.萬国地理（World Geography）黃潤德 譯 普成館
上 亜細亜 地理 位置 （Location and geography in Asia)
二 海岸
亜細亜●海岸線●欧羅巴・・・・・省略
一 北極洋●側
二 太平洋●側
...省略.....西方樺太島●本陸間●在●韃靼海峡●過●●日本海●南下
○○朝鮮海峡●過●黄海●入●●・・・・・・
(2. Pacific ocean side ..........West Sakharin island, Tatar Strait..after that Sea of Japan....Strait of Korea, after that Yellow Sea.
第二章 日本 P32(N36)
二 境域 日本X四面X 海XX伊賀氏X沙XX北太平洋XX北亜米利加州X向XX北X千島海峡X隔てるX露領XXXXXX半島X接XX宗谷海峡XXXX露領 からふと島X対XX西X滞水X朝鮮海峡X隔XX朝鮮半島X向X台湾海峡XXXX清国福建省X隔XX？島XX三個弓型X成XXXXXX海X日本海及東海水X擁XXX南X XX海峡........
Thw description on P32 Donghae means East China sea, It can confirmed another related page as follows
P33/N37 P36/N40 there are the description of East Sea (It means East China Sea)
P36/N40 there are the description of East Sea (It means East China Sea)
In 1907. Daehan-Shin-jiji大韓新地志, published by anti-Japanest 張志淵 he wrote Big Korean Sea
大韓海,also
But, on the text part he wrote
Japan sea 日本海
Strait Korea -朝鮮海峡（Joseon(Korea)Strait)
Yellow Sea- 黄海（Yellow Sea)
on the other hand the attached map of Daehan-sin-jisi describes Daehanhe(Great Korean Sea:Left)
1908’s Great Korean Imperial Map （大韓帝国地図）wrote as weｌｌ （Right side map)
1908. Newest High DaehanJiji最新高等大韓地誌 describes Sea of Chosun(Korea)朝鮮海, which suggests today’s East Korean Gulf東朝鮮湾, that is to say, BroughtonBay which was commonly recognized in international society at that time. On the other hand, they use Sea of Japaan in the east of Korean penunsula which the sea off-shore area. https://search.i815.or.kr/ImageViewer/ImageViewer.jsp?tid=co&id=3-005112-000
By the way the same book "Newest higher Daehan jisi"describes
the sea southeast of 威鏡北道 called ”日本海”（Japan Sea)
第十三編 威鏡南道 第一課 位置境界
咸鏡南道X位置境界X東X接X日本海X面XX東北一帯X白頭山
's location and border, east end faces Sea of Japan.
第十四編 咸鏡北道 第一課 位置境界
本堂X位置協会X我邦東北端X在X東北、南面X豆満江X隔XX清国吉林省X我国領地XXXX,X交接XXX
東南X日本海X遠面XX西X威鏡南道
1
909朝鮮地理統計 In the Korea’S geography statictics 朝鮮地理統計 on 1909 using
Sea of Japan日本海.
1909.1910.(新訂)中等萬國新地志 金鴻卿 編纂 廣學書館
Korea National Digital Archives Library
第二章 亜細亜 (1909/1910 same)
第一節 総論
沿海 P52
日本海、黄海、 朝鮮海（別称蒼海）、支那海
..............................................................................
右諸海中、北氷洋 舟編 不通●●●●海●●●日本海.....
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第三節 日本帝国 （1909/1910 same）
西北X日本海................................西南X東海
Japan.....Northwest is Japan Sea............South West is East (China)Sea.
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Korea after the Separated From Japan on 1945, they use Sea of Japan and There were disputed the name of Sea of Japan. I will write about this next time. I recommend to check his blog about the naming dispute issue aroud 1950.MR Nidanosuke Blog
Remarks; Korean use the name of "Sea of Japan"
https://sites.google.com/site/japanseamerdujapon/Home/korean-use-the-name-of-sea-of-japan-i
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%E4%B8%AD%E7%AD%89%E8%90%AC%E5%9C%8B%E6%96%B0%E5%9C%B0%E5%BF%97+%E6%97%A5%E6%9C%AC.jpg)
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