Columbia subject headings:
Harvard subject headings:
Authors, Korean--Correspondence.
Chŏng, Yag-yong, 1762-1836--Correspondence.
Hong, Sŏk-chu, 1774-1842--Correspondence.
Kim, Mae-sun, 1776-1840--Correspondence.
Scholars--Korea--Correspondence.
Princeton subject headings:
Authors, Korean--Correspondence.
Chŏng, Yag-yong, 1762-1836--Correspondence.
Hong, Sŏk-chu, 1774-1842--Correspondence.
Kim, Mae-sun, 1776-1840--Correspondence.
Scholars--Korea--Correspondence.