Columbia subject headings:
Harvard subject headings:
Longe, Robert de, 1645-1709--Catalogues raisonnés.
Longe, Robert de, 1645-1709.
Princeton subject headings:
Art patronage--Italy--Piacenza--History.
Catalogs.
De Longe, Roberto, 1646-1709--Catalogs.
De Longe, Roberto, 1646-1709--Criticism and interpretation.
Painting, Italian--Italy--Piacenza.