Columbia subject headings:
Harvard subject headings:
Documentary television programs--Danube River Valley--Congresses.
Swabians--Danube River Valley--History--Congresses.
Television and history--Congresses.
Princeton subject headings:
Documentary television programs--Danube River Valley--Congresses.
Swabians--Danube River Valley--History--Congresses.
Television and history--Congresses.