Columbia subject headings:
Harvard subject headings:
Agricultural laborers--Italy--Bologna (Province)
Agriculture--Economic aspects--Italy--Bologna (Province)
Agriculture--Italy--Bologna (Province)
Land tenure--Italy--Bologna (Province)
Princeton subject headings:
Agricultural laborers--Italy--Bologna (Province)--Political activity--History.
Agriculture--Italy--Bologna (Province)--History.
Land tenure--Italy--Bologna (Province)--History.