Columbia subject headings:
Architects--Italy--Correspondence.
Architecture, Italian--Russia (Federation)--Saint Petersburg.
Neoclassicism (Architecture)--Russia (Federation)--Saint Petersburg.
Quarenghi, Giacomo, 1744-1817--Correspondence.
Harvard subject headings:
Quarenghi, Giacomo, 1744-1817--Correspondence.
Quarenghi, Giacomo, 1744-1817--Manuscripts.
Princeton subject headings:
Architecture--Russia (Federation).
Quarenghi, Giacomo, 1744-1817--Archives.
Quarenghi, Giacomo, 1744-1817--Correspondence.