Columbia subject headings:
Strikes and lockouts--Miners--Spain--Asturias--History--20th century--Congresses.
Strikes and lockouts--Spain--History--20th century--Congresses.
Harvard subject headings:
Asturias (Spain)--History--20th century.
Labor unions--Spain--Asturias--History.
Labor unions--Spain--History
Spain--History--1939-1975.
Strikes and lockouts--Spain--Asturias--History.
Strikes and lockouts--Spain--History.
Princeton subject headings: