The collection “Library of Prof. Boyan Penev – title pages” includes books and serials from the private collection of the Bulgarian scientist Prof. Boyan Penev. This collection contains digitized title pages of Prof. Penev’s library with handwritten inscriptions or personal signatures. The collection “Library of Prof. Boyan Penev” consists of 9 sub-collections divided by the language of publications. This structure of the collection allows research on cultural and scientific contacts of Prof. Boyan Penev through his book preferences. Prof. Penev’s collection was officially presented in 2017 on the occasion of the 135th anniversary of his birth.