The Dibner Library is the Smithsonian’s collection of rare books and manuscripts relating to the history of science and technology. Contained in this world-class collection of 35,000 rare books and 2,000 manuscript groups are many of the most important works dating from the fifteenth to the nineteenth centuries in the history of science and technology including engineering, transportation, chemistry, mathematics, physics, electricity, and astronomy. The Dibner Library shares this collection with the public through exhibitions in an adjacent gallery, through loans to other institutions’ exhibits, and through public programs.