Columbia subject headings:
Biblioteca ambrosiana--Catalogs.
Frank M. Folsom Microfilm Collection--Catalogs.
Manuscripts on microfilm--Catalogs.
Manuscripts--Italy--Milan--Catalogs.
Harvard subject headings:
Biblioteca ambrosiana--Catalogs.
Frank M. Folsom Microfilm Collection--Catalogs.
Manuscripts on microfilm--Catalogs.
Manuscripts--Italy--Milan--Catalogs.
Princeton subject headings:
Biblioteca ambrosiana--Catalogs.
Catalogs.
Manuscripts on microfilm--Catalogs.
Manuscripts--Italy--Milan--Catalogs.
Medieval Institute of the University of Notre Dame. Frank M. Folson Microfilm Collection--Catalogs.