Columbia subject headings:
Harvard subject headings:
Bacon, Roger, 1214?-1294--Criticism and interpretation.
Bacon, Roger, 1214?-1294. Communia Naturalium.
Philosophy, Medieval.
Princeton subject headings:
Bacon, Roger, 1214?-1294. Communia naturalium--Congresses.
Philosophy of nature--History--To 1500--Congresses.