Columbia subject headings:
Harvard subject headings:
Agricultural productivity--Italy--Lombardy--History.
Agriculture and state--Italy--Lombardy--History.
Agriculture--Economic aspects--Italy--Lombardy--History.
Peasants--Italy--Lombardy--History.
Princeton subject headings:
Agricultural productivity--Italy--Lombardy--History.
Agriculture and state--Italy--Lombardy--History.
Agriculture--Economic aspects--Italy--Lombardy--History.
Peasants--Italy--Lombardy--History.