Columbia subject headings:
Harvard subject headings:
Austria--Civilization--19th century--Congresses.
Austria--Civilization--20th century--Congresses.
Austria--Relations--United States--Congresses.
United States--Civilization--1865-1918--Congresses.
United States--Civilization--1918-1945--Congresses.
United States--Relations--Austria--Congresses.
Princeton subject headings:
Austria--Civilization--19th century--Congresses.
Austria--Civilization--20th century--Congresses.
Austria--Relations--United States--Congresses.
United States--Civilization--1865-1918--Congresses.
United States--Civilization--1918-1945--Congresses.
United States--Relations--Austria--Congresses.