The St. Petersburg digest of selected works by Professor Valery P. Leonov published in specialized editions in the period of 1972–2020 is reviewed. The digest was published in St. Petersburg. The works for the digest were selected by Valery Leonov himself. “The Selected Works” comprise his papers, interviews and communications and reflect the dynamics of Leonov’s scholarly interests and preferences in library and information segment. The digest is divided into eight subject sections: 1) Bibliology: new aspects of theory; 2) Library science as a fundamental science; 3) Bibliographic information and the problems of its surrogation; 4) Library and bibliographic processes as a social phenomenon; 5) Bibliography: in search of a new paradigm; 6) The concept of the exact bibliography science; 7) Biography of the Library of the Academy of Sciences: an experiment; 8) The International Association of Bibliophiles and the Library of Russian Academy of Sciences. The special section of the digest is dedicated to Leonov’s teachers, colleagues and friends. In the epilogue, the readers will learn about several episodes of Leonov’s biography. The book is supplemented with the detailed name index. The digest will be of interest to the wide library and information professional community.