Columbia subject headings:
Harvard subject headings:
Korean language--Alphabet.
Korean language--Middle Korean, 935-1500.
Korean language--Phonetics.
Sejong, King of Korea, 1397-1450. Hunmin chŏngŭm.
Princeton subject headings:
Korean language--Middle Korean, 935-1500.
Korean language--Phonetics.
Sejong, King of Korea, 1397-1450. Hunmin chŏngŭm.