XILOGRAFICI, LIBRI (fr. Livres xylographiques; ingl. Blochbooks; ted. Blochbücher). — A bibliographical term designating small books composed of woodcuts with figures and a brief explanatory text, printed on several sheets on one side only, pasted together on the unprinted side and assembled so as to form a sort of illustrated booklet. Sometimes the woodcuts contain only the figure or, less often, only the text; in older copies the text (caption) is found written by hand, and for this reason they are called «libri xilochirografici». There are also copies of l. X. with captions printed in movable type.

The l. x., produced especially in the Netherlands and Germany, contain, for the most part, sacred representations, but there are also copies with profane representations or didactic texts; among the former are to be remembered the Speculum humanae salvationis, the Ars moriendi, the Apocalypse, the Symbolum Apostolicum, the Defensorium virginitatis Mariae, the Exercitium super Pater noster and, the most famous of all, the Biblia pauperum, a kind of summary of the Old and New Testaments in 40 or 50 woodcuts. The second group includes the Mirabilia Romae, the Dance of Death (Der Totentanz), several Calendars, the series of the Planets, and a small group of «Donati», elementary Latin grammars.
The l. X. met with only scant and sporadic success in Italy. The best-known Italian copies are: Mirabilia Romae (about 1450), the Berlin Passio (Venice 1460), Opera nova contemplativa, a variant of the Biblia pauperum (there 1510), Operina da imparare di scrivere littera cancelleresca by Ludovico degli Arrighi «Vicentino» (Rome 1522), perhaps the last book of the genre. The l. X. known to date comprise more than thirty texts, with a total of just over one hundred copies, nearly all of them very rare or known in a single copy.