The selection on display offers an overview of rare and original editions of missals and pontificals that are distinguished by the refinement of the decorations and the artistic creativity of printers and skilled engravers, as well as for the precious leather covers with impressions in gold of the coats of arms of the bishops. The block of cards is made of excellent workmanship, handmade with high quality raw materials, visible in the watermark of the papers produced by well-known Italian paper mills.

Inside the missals there are several engravings, made with burin and etching, by well-known artists: LudovicoCasoli, Vincent Hubert, Giovanni Battista Galestruzzi and GaspareMassi. Among the engravings, that of Giovanni Guerrini of Urbino and that of the Vatican typography of Giovanni Maria Salvioni stand out for their excellent typography. In the typographic art, Salvioni stands out for the beauty of the characters, the headboards, the title pages, the friezes, making use of the collaboration of painters, designers and engravers of renowned expertise, also contributing to the development and progress of the publishing activity of the Rome of Eighteenth century.

The exhibition is integrated with the permanent exposition of a collection of the oldest liturgical books in the apposite room of the Diocesan Museum. The oldest liturgical book is the missal that belonged to Bishop Rhini (1676-1696), dated 1658, currently on display at the MUDIA. The missals and pontificals that belonged to the bishops Antonio LanzaTrabia (1769-1775), Antonio Colonna Branciforte (1776-1786), Baldassare Leone (1818-1820), Pietro Maria D'Agostino (1823-1835) were later recovered.

The rich series is personalized through the enclosure of the bishops' coats of arms, engraved on the leather covers.