Columbia subject headings:
Harvard subject headings:
Architecture--Europe--Exhibitions.
Architecture--Sources--Exhibitions.
Building--Europe--Exhibitions.
City planning--Europe--Exhibitions.
Engineering--History--Sources--Exhibitions.
Military architecture--Europe--Exhibitions.
Military architecture--Sources--Exhibitions.
Princeton subject headings:
Architecture--History--Exhibitions.
Engineering--History--Exhibitions.
Military architecture--Exhibitions.