Columbia subject headings:
Agricultural laborers--Italy--Periodicals.
Working class--Italy--Periodicals.
Harvard subject headings:
Agricultural laborers--Italy--Po River Valley--Periodicals.
Peasants--Italy--Po River Valley--Periodicals.
Po River Valley (Italy)--Economic conditions--Periodicals.
Po River Valley (Italy)--Social conditions--Periodicals.
Working class--Italy--Po River Valley--Periodicals.
Princeton subject headings:
Agricultural laborers--Italy--Periodicals.
Working class--Italy--Periodicals.