Columbia subject headings:
Harvard subject headings:
Agricultural laborers--Austria--Upper Austria--Political activity--History--20th century.
SPÖ-Bauern Landesorganisation Oberösterreich--History.
Princeton subject headings:
Agriculture--Austria--Upper Austria--Societies, etc.--History.
Farmers--Austria--Upper Austria--Political activity--History.
SPÖ-Bauern Landesorganisation Oberösterreich--History.