Columbia subject headings:
Harvard subject headings:
Agricultural colonies--Italy--Ostia--History.
Agricultural laborers--Italy--Ostia--History.
Agriculture, Cooperative--Italy--Ostia--History.
Communal living--Italy--Ostia--History.
Socialism--Italy--Ostia.
Socialists--Italy--Ostia--History.
Princeton subject headings:
Agricultural colonies--Italy--Ostia--History.
Agricultural laborers--Italy--Ostia--History.
Agriculture, Cooperative--Italy--Ostia--History.
Socialism--Italy--Ostia--History.
Socialists--Italy--Ostia--History.