Columbia subject headings:
Langland, William, 1330?-1400? Piers Plowman.
Langland, William, 1330?-1400?--Criticism, Textual.
Harvard subject headings:
Langland, William, 1330?-1400? Piers Plowman.
Langland, William, 1330?-1400?--Criticism, Textual.
Princeton subject headings: