Columbia subject headings:
Microfilms--Catalogs.
Science--Bibliography--Catalogs.
Harvard subject headings:
Manuscripts on microfilm--Italy--Milan--Catalogs.
Manuscripts, Medieval--Italy--Milan--Microform catalogs.
Microfilms--Catalogs
Science--Bibliography--Catalogs
Science--Manuscripts--Microform catalogs.
Princeton subject headings:
Catalogs.
Manuscripts on microfilm--Italy--Milan--Catalogs.
Manuscripts, Medieval--Ialy--Milan--Microform catalogs.
Science--Manuscripts--Microform catalogs.