The libraries of the National Institute for Astrophysics contain over 125,000 monographs.
Although most of the books deal with astronomy and physics, texts on meteorology, mathematics, geography and philosophy, all disciplines connected in some way to astronomy, are not lacking.
All of the oldest astronomical observatories possess precious books collections. Some of the volumes are real cultural milestones; the work of Galileo, Copernicus, Ptolemy, Kepler and Newton (often first editions), considered the banners of the scientific revolution, have lit the way to modern science.
INAF libraries also have about 2,500 periodicals, including about a hundred current subscriptions. They also guarantee their researchers the online access to astronomical journals and databases.