Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--Italy--Valdichiana.
Reclamation of land--Italy--Valdichiana.
Sharecropping--Italy--Valdichiana.
Valdichiana (Arezzo, Italy)--Rural conditions.
Princeton subject headings:
Agriculture--Italy--Chiana River Valley--History.
Land use, Rural--Italy--Chiana River Valley--History.
Reclamation of land--Italy--Chiana River Valley--History.