Columbia subject headings:
Harvard subject headings:
Families--Korea--Miscellanea.
Korea--Social life and customs--1392-1910.
Korean letters--Korea.
Kwak family--Correspondence.
Scholars--Korea--Correspondence.
Princeton subject headings:
Korea--Intellectual life--1637-1864.
Korea--Social life and customs--17th century.
Korea--Social life and customs--18th century.
Korean letters--History and criticism.
Kwak family--Correspondence.
Scholars--Korea--Correspondence.