Columbia subject headings:
Harvard subject headings:
Chŏng, Yag-yong, 1762-1836
Civil service ethics--Korea--19th century.
Local government--Korea--19th century.
Public administration--Korea--19th century.
Princeton subject headings:
Chŏng, Yag-yong, 1762-1836--Political and social views.
Civil service ethics--Korea--History--18th century.
Political science--Philosophy--History--18th century.