Columbia subject headings:
Harvard subject headings:
English language--Old English, ca. 450-1100--Dialects--Mercia (Kingdom)
English language--Old English, ca. 450-1100--Phonology
Grammar, Comparative and general--Phonology
Princeton subject headings:
English language--Old English, ca. 450-1100--Dialects--Mercia (Kingdom).
English language--Old English, ca. 450-1100--Phonology.
Grammar, Comparative and general--Phonology.