Columbia subject headings:
Architecture, Medieval--Moselle River Valley--Congresses.
Architecture--Moselle River Valley--Congresses.
Castles--Conservation and restoration--Moselle River Valley--Congresses.
Castles--Moselle River Valley--Congresses.
Historicism in architecture--Moselle River Valley--Congresses.
Romanticism in architecture--Moselle River Valley--Congresses.
Ruined buildings--Moselle River Valley--Congresses.
Harvard subject headings:
Architecture, Medieval--Moselle River Valley--Congresses.
Castles--Conservation and restoration--Moselle River Valley--Congresses.
Castles--Moselle River Valley--Congresses.
Historicism in architecture--Moselle River Valley--Congresses.
Romanticism in architecture--Moselle River Valley--Congresses.
Princeton subject headings:
Architecture, Medieval--Moselle River Valley--Congresses.
Architecture--Moselle River Valley--Congresses.
Castles--Conservation and restoration--Moselle River Valley--Congresses.
Castles--Moselle River Valley--Congresses.
Historicism in architecture--Moselle River Valley--Congresses.
Romanticism in architecture--Moselle River Valley--Congresses.
Ruined buildings--Moselle River Valley--Congresses.