Columbia subject headings:
Anarchism--Spain--Asturias.
Labor unions--Spain--Asturias.
Syndicalism--Spain--Asturias.
Harvard subject headings:
Anarchism--Spain--Asturias--History.
Confederación Nacional del Trabajo (Spain)--History.
Syndicalism--Spain--Asturias--History.
Princeton subject headings:
Anarchism--Spain--Asturias.
Labor unions--Spain--Asturias.
Syndicalism--Spain--Asturias.