Columbia subject headings:
Ch'ae, Che-gong, 1720-1799.
Chŏng, Yag-yong, 1762-1836.
Chŏngjo, King of Korea, 1752-1800--Friends and associates.
Korea--Civilization--18th century.
Korea--History--1637-1864.
Harvard subject headings:
Ch'ae, Che-gong, 1720-1799
Chŏng, Yag-yong, 1762-1836
Chŏngjo, King of Korea, 1752-1800--Friends and associates.
Korea--Civilization--18th century.
Korea--History--1637-1864
Princeton subject headings:
Ch'ae, Che-gong, 1720-1799.
Chŏng, Yag-yong, 1762-1836.
Chŏngjo, King of Korea, 1752-1800.
Korea--History--18th century.
Korea--Politics and government--18th century.