Columbia subject headings:
Mysticism--History--Congresses.
Petrarca, Francesco, 1304-1374--Criticism and interpretation--Congresses.
Harvard subject headings:
Mysticism and poetry--Congresses.
Mysticism--History--Congresses.
Petrarca, Francesco, 1304-1374--Criticism and interpretation--Congresses.
Princeton subject headings:
Mysticism--History--Congresses.
Petrarca, Francesco, 1304-1374--Criticism and interpretation--Congresses.