Columbia subject headings:
Agriculture--Italy--Lombardy--History--18th century.
Irrigation--Italy--Lombardy--History.
Lombardy (Italy)--History.
Mulberry--Italy--Lombardy--History--19th century.
Pellagra--Italy--Lombardy--History--19th century.
Harvard subject headings:
Agriculture--Italy--Lombardy--History--18th century.
Irrigation--Italy--Lombardy--History.
Lombardy (Italy)--History.
Mulberry--Italy--Lombardy--History--19th century.
Pellagra--Italy--Lombardy--History--19th century.
Princeton subject headings: