Columbia subject headings:
Cooperation--Italy--History--19th century--Congresses.
Cooperation--Italy--History--20th century--Congresses.
Cooperative societies--Italy--History--19th century--Congresses.
Cooperative societies--Italy--History--20th century--Congresses.
Harvard subject headings:
Agriculture, Cooperative--Italy--History--Congresses.
Cooperation--Italy--History--19th century--Congresses.
Cooperation--Italy--History--20th century--Congresses.
Cooperation--Italy--History--Congresses.
Cooperative societies--Italy--History--19th century--Congresses.
Cooperative societies--Italy--History--20th century--Congresses.
Mutualism--Italy--History--Congresses.
Princeton subject headings: