This catalogue updates an previous study of the illustrated books by Massimo Mussini ("I libri di Baj", Reggio Emilia, Electa, 1990); it lists all books found in the preceeding work, but only illustrates entries 38-52. This also contains a concordance to earlier compilations by Jean Petit of the artist's graphic work including the illustrated books (v. database "Catalogue de l'oeuvre graphique et des multiples…", Geneva, 1970-)