Columbia subject headings:
Harvard subject headings:
English language--Old English, ca. 450-1100--Diphthongs.
English language--Old English, ca. 450-1100--Phonology
Princeton subject headings:
Civilization, Anglo-Saxon.
English language--Old English, ca. 450-1100--Diphthongs.
English language--Old English, ca. 450-1100--Phonology.