The Biblioteca Leonardiana, headquartered in the castle of the Counts Guidi, is dedicated principally to fruition of the works of Leonardo da Vinci. The library, in fact, was born with Gustavo Uzielli, one of the greatest Leonardo scholars of the second half of the 19th century. Over time it has become one of the most important centers for Leonardo studies, with its collections representing a heritage numbering over 13,000 items. Included are all printed editions of Leonardo’s works, starting from 1651; the facsimile reproductions of manuscripts and drawings; and also a section of sources, texts, and specialized periodicals. The complete collection of Leonardo's work is now digitally available, thanks to the e-Leo project. The digital archive was created with the dual purpose of preserving the documentary material and offering a technologically advanced tool for study of Leonardo's work. In fact, e-Leo allows anyone to consult digital reproductions of thousands of Leonardo's papers and texts, and to use multiple search functions for selecting documentation of interest, as well as tools to refine and personalize one’s research.