Columbia subject headings:
Architecture.
Piranesi, Giovanni Battista, 1720-1778--Congresses.
Harvard subject headings:
Piranesi, Giovanni Battista, 1720-1778--Congresses.
Piranesi, Giovanni Battista, 1720-1778--Contributions in architecture--Congresses.
Princeton subject headings:
Piranesi, Giovanni Battista, 1720-1778--Congresses.