The following is a map of Ulleungdo, from a book entitled "Joseon Paldo Jido (朝鮮八道地). It is a cutout from a map of Pyongando (平安道), Hwanghaedo (黃海道), and Gangwondo (江原道). As far as I know, the date of the map is unknown. The map is stored in the Kyujanggak Institute for Korean Studies at Seoul National University.
Notice that it shows a small island just off the east shore of Ulleungdo labelled 于山 (Usan). Today, Koreans call the island Jukdo (竹島 - 죽도), which is about two kilometers off Ulleungdo's northeast shore. Some Koreans claim that Usan was the old Korean name for Liancourt Rocks (Dokdo / Takeshima), but there is no Korean map or documentary evidence to support the claim.
Let me know if this map has already been posted here.