Columbia subject headings:
Harvard subject headings:
Anarchism--Argentina--Buenos Aires--History.
Buenos Aires (Argentina)--History.
Buenos Aires (Argentina)--Social conditions.
Labor movement--Argentina--Buenos Aires--History.
Labor unions--Argentina--Buenos Aires--History.
Princeton subject headings:
Anarchism--Argentina--Buenos Aires--History.
Buenos Aires (Argentina)--Social conditions.
Labor movement--Argentina--Buenos Aires--History.