366597
Korean claims are partly based on references to a Korean island called Usan-do ( 우산 , 于山島 / 亐山島 ) in various historical records , maps , and encyclopedia such as Samguk Sagi , Annals of Joseon Dynasty , Dongguk Yeoji Seungnam , and Dongguk munhon bigo .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None