Columbia subject headings:
Cooperative societies--Italy--Ferrara (Province)--History.
Lega provinciale delle cooperative e mutue di Ferrara--History.
Harvard subject headings:
Cooperative societies--Italy--Ferrara (Province)--History--20th century.
Lega provinciale delle cooperative (Ravenna, Italy)--History--20th century.
Mutualism--Italy--Ferrara (Province)--History--20th century.
Princeton subject headings:
Cooperative societies--Italy--Ferrara (Province)--History--20th century.
Lega provinciale delle cooperative (Ravenna, Italy)--History--20th century.
Mutualism--Italy--Ferrara (Province)--History--20th century.