Columbia subject headings:
Harvard subject headings:
Chaucer, Geoffrey, -1400--Criticism and interpretation.
English poetry--Middle English, 1100-1500--History and criticism
Langland, William, 1330?-1400? Piers Plowman.
Princeton subject headings:
Chaucer, Geoffrey, -1400--Criticism and interpretation.
English poetry--Middle English, 1100-1500--History and criticism.
Langland, William, 1330?-1400? Piers Plowman.