Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--Modica (County)--History.
Drainage--Modica (County)--History.
Modica (Italy)--Economic conditions.
Reclamation of land--Modica (County)--History.
Princeton subject headings:
Agriculture and state--Italy--History.
Agriculture--Economic aspects--Contea di Modica--History.
Land tenure--Contea di Modica.
Land use--Contea di Modica--History.
Modica (County)--Rural conditions.
Reclamation of land--Contea di Modica--History.