Columbia subject headings:
Labor movement--Spain--History--Congresses.
Popular culture--Spain--History--Congresses.
Socialism and culture--Spain--History--Congresses.
Harvard subject headings:
Princeton subject headings:
Politics and culture--Spain--History--Congresses.
Popular culture--Spain--Congresses.
Socialism and culture--Spain--History--Congresses.
Spain--Civilization--Congresses.
Spanish literature--Social aspects--Congresses.
Working class--Spain--History--Congresses.