1-4 of 4 Books
Ssuk kwa manŭl
By Wŏn-hŭng Hwang
Han'guk kwahak sasangsa
By Sŏng-nae Pak
Tongyang ch'ŏnmun sasang, hanŭl ŭi yŏksa
By Il-gwŏn Kim
팔괘의과학적탐구
By 이승재