Columbia subject headings:
Harvard subject headings:
Poor--Austria--Congresses.
Poor--Employment--Austria--Congresses.
Poor--Employment--Europe--Congresses.
Working class--Austria--Congresses.
Working poor--Austria--Congresses.
Working poor--Austria--Social conditions--Congresses.
Working poor--Europe--Social conditions--Congresses.
Princeton subject headings:
Poor--Austria--Congresses.
Working class--Austria--Congresses.
Working poor--Austria--Congresses.