Columbia subject headings:
Demonstrations--Italy--Emilia-Romagna--History--19th century.
Grain--Taxation--Italy--Emilia-Romagna--History--19th century.
Peasant uprisings--Italy--Emilia-Romagna--History--19th century.
Peasants--Italy--Emilia-Romagna--History--19th century.
Strikes and lockouts--Agricultural laborers--Italy--Emilia-Romagna--History--19th century.
Harvard subject headings:
Demonstrations--Italy--Emilia-Romagna--History--19th century.
Grain--Taxation--Italy--Emilia-Romagna--History--19th century.
Peasant uprisings--Italy--Emilia-Romagna--History--19th century.
Peasants--Italy--Emilia-Romagna--History--19th century.
Strikes and lockouts--Agricultural laborers--Italy--Emilia-Romagna--History--19th century.
Princeton subject headings:
Agricultural laborers--Italy--History.
Farm mechanization--Italy--History.
Labor supply--Italy--Effect of automation on--History.