The volume deals with the history of the private libraries and the circulation on books in Verona during the first half of the 15th century. The work is based on the perusal and analysis of 873 ancient inventories, preserved at the State Archive of Verona in the Istrumenti of the Antico Ufficio del Registro. The research has highlighted 85 inventories with items of books, of which edition is given together with other archival documents (wills, transactions of various kinds, etc.) in a corpus of 113 documents. The first part of volume describes the archival fund, documentary typologies and the various types libraries owned by nobility, lawyers, notaries, doctors, professors, teachers, merchants and artisans. A chapter is dedicated to women’s books and libraries. In the second part the edition of all documents is given in chronological order and by owner organized into records. They register the following identifying elements: name of owner, date and place, summary, list of witnesses and notaries, archival reference, bibliography, editions of the documents, identification of the authors or works cited in the items, a catalogue on the circulation of books and their readers. The witnesses and the notaries of the inventories and archival documents draw a picture of the relationships between the families that contributes to a historical-cultural reconstruction in order to shed light on the entourage of the owner of the library and his cultural and social ties with Verona.