Columbia subject headings:
Labor leaders--Spain--Exhibitions.
Labor movement--Spain--History--20th century--Exhibitions.
Labor unions--Spain--History--20th century--Exhibitions.
Largo Caballero, Francisco, 1869-1946--Exhibitions.
Harvard subject headings:
Princeton subject headings:
Labor leaders--Spain--Exhibitions.
Labor movement--Spain--History--20th century--Exhibitions.
Labor unions--Spain--History--20th century--Exhibitions.
Largo Caballero, Francisco, 1869-1946--Exhibitions.