Columbia subject headings:
Libraries--Italy--History--16th century.
Marcellus II, Pope, 1501-1555--Libraries.
Harvard subject headings:
Illumination of books and manuscripts--Vatican City--Catalogs.
Manuscripts--Vatican City--Catalogs
Marcellus II, Pope, 1501-1555--Library--Catalogs.
Private libraries--Vatican City--Catalogs.
Princeton subject headings:
Libraries--Italy--History--16th century.
Marcellus II, Pope, 1501-1555--Libraries.