Columbia subject headings:
Harvard subject headings:
Cooperation--Italy--Marche--History--Congresses.
Cooperative societies--Italy--Marche (Province)--History--Congresses.
Fraternal organizations--Italy--Marche--History--Congresses.
Mutualism--Italy--Marche (Province)--History--Congresses.
Solidarity--Italy--Marche--History--Congresses.
Princeton subject headings:
Fraternal organizations--Italy--Marche--History--19th century.
Fraternal organizations--Italy--Marche--History--20th century.