Borello and Casella, Introduction / Part I Linking networks through pages: men of letters and their friends / Volpini, From Florence to Salamanca and back: the collection of books and manuscripts of Girolamo da Sommaia (early 16th century) / Valeri, ≪Un ricchissimo gioiello di Roma≫. Creation, visibility and dispersion of the Cassiano dal Pozzo library between Rome and Europe / Montcher, The Library of the Baroque Republic of Letters / Part II Collecting papers to leave a mark: physicians, scholars and clerics / Brevaglieri, Japanese papers for Baroque Rome: Angelo Rocca’s library: missionary networks and urban perennialisation / Borello, Coffers and shelves for the next generations. The destiny of Paolo Beni’s papers / Casella, Who was Pompeo Caimo’s library intended for? Family use and public endowment of a 17th century physician’s and polygraph’s book collection / Chapron, Dead men’s papers. The patrimony of scholarly papers in 18th century France / Part III Collecting papers to leave a mark: technicians and jurists / Favino, The books of the ‘invisible technician’ Gaspare Berti (1601-1643): a wealth of knowledge in Baroque Rome / Feci, Jurists’ Libraries in 17th Century Rome / Part IV Papers to create a museum: wishes and aspirations of noble patrons and other donors / Mazzetti di Pietralata, The agent and the connoisseur: self-attribution of roles in and around the Savelli painting collection through their letters / Moralejo, The legacy of Catalina de Mendoza to the Colegio Maximo / Borean, Art libraries and art collecting in Venice in the 18th century. The Manfrin library / Fiorelli, From private collection to shared heritage. An aristocratic donation in 19th century Naples / Jornet Benito, Two women writers within the walls of a library-museum. A documentary legacy in 19th century Spain.