The University of Milan has a network of 47 libraries. Some are dedicated to the main disciplinary areas, while a number of more specialised libraries are primarily used for research purposes.
All libraries share the same OPAC (Online Public Access Catalogue) - accessible 24 hours a day, 7 days a week from any internet-enabled computer - which contains approximately one million bibliographic records covering old and modern books, printed and electronic periodicals and audiovisual material.
Books are classified according to subject, and using the more detailed DDC (Dewey Decimal Classification) system.
Many libraries provide document delivery and interlibrary loan services, through an exchange network that encompasses the most important libraries in Italy and the rest of Europe.
The library system also incorporates the APICE Centre which collects and preserves valuable and rare books and archives.
Accessible from search engines such as Google and Scirus, AIR provides digital versions of many of these records.
The library network also provides internal users with access to a large number of electronic journals of educational and scientific interest.