Columbia subject headings:
Harvard subject headings:
Chŏng, Yag-yong, 1762-1836--Correspondence.
Korean poetry--To 1900
Philosophy, Confucian--Korea.
Yi, Chae-ŭi--Correspondence.
Princeton subject headings:
Chŏng, Yag-yong, 1762-1836--Correspondence.
Four beginnings and seven feelings thesis.
Neo-Confucianism--Korea.
Philosophers--Korea--Correspondence.
Yi, Chae-ŭi, 1772-1839--Correspondence.