Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--Italy--History.
Agriculture--Italy--History
Agriculture--Social aspects--Italy--History.
Colegio de España (Bologna, Italy)
Princeton subject headings:
Agriculture--Economic aspects--Italy--Bologna--History.
Agriculture--Social aspects--Italy--Bologna--History.
Bologna (Italy)--History.
Colegio de España (Bologna, Italy)--History.