Columbia subject headings:
Harvard subject headings:
Chʻungju-gun (Korea)--History.
Chʻŏnan-gun--History.
Hawanggan-gun (Korea)--History.
Princeton subject headings:
Chʻŏnan-gun--History.
Chʻungju-gun (Korea)--History.
Hwanggan-gun (Korea)--History.
Korea--History--Chosŏn dynasty, 1392-1910.