Columbia subject headings:
Agricultural laborers--Labor unions--California--History--20th century.
Agricultural laborers--Political activity--California--History--20th century.
Social movements--United States--History--20th century.
United Farm Workers--History.
Harvard subject headings:
Agricultural laborers--California--Political activity--History--20th century.
Agricultural laborers--Labor unions--California--History--20th century.
Social movements--United States--History--20th century
United Farm Workers--History.
Princeton subject headings:
Agricultural laborers--California--Political activity--History--20th century.
Agricultural laborers--Labor unions--California--History--20th century.
Social movements--United States--History--20th century.
United Farm Workers--History.