Columbia subject headings:
Harvard subject headings:
Lombardy (Italy)--History--1268-1492.
Princeton subject headings:
Agriculture--Economic aspects--Italy--Lombardy--History.
Cistercians--Italy--Lombardy--History.
Feudalism--Italy--Lombardy--History.
Land tenure--Italy--Lombardy--History.
Lombardy (Italy)--History--1268-1492.