Columbia subject headings:
Encyclopedias and dictionaries--History and criticism.
English poetry--Middle English, 1100-1500--History and criticism.
English poetry--Old English, ca. 450-1100--History and criticism.
Harvard subject headings:
Didactic poetry, English (Old)--History and criticism.
English poetry--Old English, ca. 450-1100--History and criticism
Princeton subject headings:
Encyclopedias and dictionaries--History and criticism.
English poetry--Middle English, 1100-1500--History and criticism.
English poetry--Old English, ca. 450-1100--History and criticism.