On his site, "Licking the Outside of Watermelon" (수박 겉핥기), cms1530 has some great copies of Korean pennisula and Ulleungdo maps, including a great copy of Samcheok Museum's Ulleungdo map HERE. Check out his site HERE. It is quite interesting.
Also, the Dokdo Guardian has started posting again, which is great news. I missed reading his opinions.