Columbia subject headings:
Lorenzetti, Ambrogio, 1285-approximately 1348--Criticism and interpretation.
Trade routes--Italy--Tuscany--History--To 1500.
Harvard subject headings:
Christian art and symbolism--Italy--Tuscany--Medieval, 500-1500.
Lorenzetti, Ambrogio, 1285-approximately 1348--Criticism and interpretation.
Trade routes--Italy--Tuscany--History--To 1500.
Princeton subject headings:
Lorenzetti, Ambrogio, 1285-approximately 1348--Criticism and interpretation.
Trade routes--Italy--Tuscany--History--To 1500.