Columbia subject headings:
Harvard subject headings:
Agricultural innovations--Korea--History.
Korea--Civilization--1392-1910--Confucian influences.
Korea--Politics and government--1392-1910.
Korea--Social conditions--1392-1910.
Princeton subject headings:
Agricultural innovations--Korea--History.
Korea--Civilization--1392-1910--Confucian influences.
Korea--Politics and government--1392-1910.
Korea--Social conditions--1392-1910.