Columbia subject headings:
Harvard subject headings:
Holidays--Political aspects--Austria--History.
Labor movement--Austria--Anniversaries, etc.
Labor movement--Austria--History--20th century.
Politics and culture--Austria--History--20th century.
Socialism--Austria--20th century.
Sozialdemokratische Arbeiterpartei Deutschösterreichs--History
Princeton subject headings:
Labor movement--Austria--Anniversaries, etc.
Labor movement--Austria--History--20th century.
Socialism--Austria--History--20th century.