Columbia subject headings:
Harvard subject headings:
Catholic labor unions--Austria--History.
Labor unions and communism--Austria--History.
Labor unions--Austria--History.
Socialism--Austria
Socialism--Austria--History
Strikes and lockouts--Austria--History.
Working class--Recreation--Austria--History.
Princeton subject headings:
Archives--Austria--Vienna--Catalogs.
Austria--History--1867-1918--Pictorial works--Catalogs.
Austria--History--1918-1938--Pictorial works--Catalogs.
Labor movement--Austria--Pictorial works--Catalogs.
Labor unions--Austria--Pictorial works--Catalogs.
Libraries--Austria--Vienna--Catalogs.
Photographs--Austria--Vienna--Catalogs.