Columbia subject headings:
Harvard subject headings:
Austria--Foreign relations--Czechoslovakia--Congresses.
Austria--Relations--Czechoslovakia--Congresses.
Czechoslovakia--Foreign relations--Austria--Congresses.
Czechoslovakia--Relations--Austria--Congresses.
Princeton subject headings:
Austria--Foreign relations--Czechoslovakia--Congresses.
Austria--Relations--Czechoslovakia--Congresses.
Czechoslovakia--Foreign relations--Austria--Congresses.
Czechoslovakia--Relations--Austria--Congresses.