Columbia subject headings:
Labor movement--Argentina--Periodicals.
Labor--Argentina--Periodicals.
Working class--Political activity--Argentina--Periodicals.
Harvard subject headings:
Labor movement--Argentina--Periodicals.
Labor--Argentina--Periodicals.
Working class--Argentina--Political activity--Periodicals.
Princeton subject headings:
Labor movement--Argentina--Periodicals.
Labor--Argentina--Periodicals.
Periodicals.
Working class--Argentina--Political activity--Periodicals.