Columbia subject headings:
Clans--Korea--History.
Korea--Genealogy.
Korea--History--Chosŏn dynasty, 1392-1910--Biography.
Yun family.
Yun, Chŏng-sŏk--Family.
Harvard subject headings:
Seoul (Korea)--Biography.
Yun family of Seoul.
Yun, Chŏng-sŏk--Family.
Princeton subject headings: