Oju yŏnmun changjŏn san'go
Oju yŏnmun changjŏn san'go is a general encyclopedia written by Yi Kyugyŏng during the late Joseon-era. It spans 60 books, covering 1,417 topics from astronomy to religion.
The document was lost until the 1920s, until member Kwŏn Posang found it being used as a wrapping paper for baked chestnuts. He took it to the, an organization founded in 1910 by Ch'oe Namsŏn to publish classical Korean literature, which confirmed its authenticity.