Below are maps of the Korean peninsula and Gangwon Province from the atlas "Donggyeong San Cheon: Paldo Jido" (東京山川 八道地圖). The date of the atlas and maps are unknown, but they were most likely made sometime before the 1800s. The atlas is stored in Korea's Koryo University Library. (Link to Korean Map)
The map of the Korean peninsula shows Ulleungdo (鬱陵島) off the east coast with a small neighboring isand labeled "于山" (Usan). Korea claims that the "island of Usan" (于山島) was the old Korean name for "Dokdo" (Liancourt Rocks), but this map, like many others, shows that Usando was a neighboring island of Ulleungdo, not Dokdo (獨島). This is confirmed by the Gangwondo (江原道) map that was included in the same atlas.
The Gangwondo map (LINK) shows a close-up of Ulleungdo with an island just off its east shore labeled "于山島" (Usando). We know that the Usando on this map was not "Dokdo" because Dokdo is ninety-two kilometers southeast of Ulleungdo and is essentially made up of two islets, not one. The maps also shows Ulleungdo with five other small islands just off its southern shore, which was a common feature of Korea's old Ulleungdo maps.
The writing below Ulleungdo gives the dimensions of the island (80 ri east to west & 50 ri north to south) and the flora and fauna found there. It also says that Ulleungdo was two days away by boat from Uljin (蔚珍), which is a place on the Korean peninsula.