Sahoe pohŏm kwa minyŏng pohŏm ŭi hyoyulchŏk yŏnʼgye panganTŏk-hun Yi · First published 1998Open the Tome
Yŏsin chŏnmun kŭmyung sanŏp ŭi tʻŭksŏng kwa palchŏn panganTŏk-hun Yi · First published 1997Open the Tome