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