Columbia subject headings:
Guercino, 1591-1666--Catalogs.
Guercino, 1591-1666--Forgeries--Catalogs.
Landscape drawing, Italian--Forgeries--Catalogs.
Landscape drawing--17th century--Forgeries--Italy--Catalogs.
Harvard subject headings:
Guercino, 1591-1666--Catalogs.
Guercino, 1591-1666--Forgeries--Catalogs.
Landscape drawing, Italian--17th century--Forgeries--Catalogs.
Landscape drawing, Italian--Forgeries--Catalogs.
Landscape drawing--17th century--Italy--Forgeries--Catalogs.
Princeton subject headings:
Guercino, 1591-1666.