Columbia subject headings:
Agriculture--Economic aspects--Italy--Sicily--History.
Grain trade--Italy--Sicily--History.
Land tenure--Italy--Sicily--History.
Sicily (Italy)--Economic conditions.
Harvard subject headings:
Agriculture--Economic aspects--Italy--Sicily--History.
Grain trade--Italy--Sicily--History.
Land tenure--Italy--Sicily--History.
Sicily (Italy)--Economic conditions
Princeton subject headings:
Agriculture--Economic aspects--Italy--Sicily--History.
Grain trade--Italy--Sicily--History.
Land tenure--Italy--Sicily--History.
Sicily (Italy)--Economic conditions.