Columbia subject headings:
Harvard subject headings:
Korea--History--Chosŏn dynasty, 1392-1910.
Middle class--Korea--History.
Professional employees--Korea--History.
Professions--Korea--History.
Social classes--Korea--History
Social status--Korea--History.
Princeton subject headings:
Korea--History--Chosŏn dynasty, 1392-1910.
Professional employees--Korea--History.
Professions--Korea--History.
Skilled labor--Korea--History.