Columbia subject headings:
Agricultural laborers--Labor unions--Spain--Villamartín (Cádiz)--History--20th century.
Labor movement--Spain--Villamartín (Cádiz)--History--20th century.
Labor unions--Spain--Villamartín (Cádiz)--History--20th century.
Villamartín (Cádiz, Spain)--History--20th century.
Harvard subject headings:
Agricultural laborers--Labor unions--Spain--Villamartín (Cádiz)--History--20th century.
Labor movement--Spain--Villamartín (Cádiz)--History--20th century.
Labor unions--Spain--Villamartín (Cádiz)--History--20th century.
Villamartín (Cádiz, Spain)--History--20th century.
Princeton subject headings: