Columbia subject headings:
Factories--Argentina--Berisso--History--20th century.
Labor movement--Political activity--Argentina--Berisso.
Harvard subject headings:
Compañía Swift de La Plata
Frigorífico Armour de La Plata.
Labor unions--Argentina--Berisso.
Packing-house workers--Argentina--Berisso--Political activity.
Packing-house workers--Argentina--Berisso.
Packing-house workers--Political activity--Argentina--Berisso.
Princeton subject headings:
Factories--Argentina--Berisso--History--20th century.
Labor movement--Argentina--Berisso--Political activity.