Consequently, modern conservators are responsible for recording the previous conservation work they find when evaluating objects.[16] As early as 750 B.C., Old Testament prophets Isaiah and Jeremiah advised on the importance of the preservation of documents for future use.[17] In 1627, Gabriel Naudé published Advis pour dresser une bibliothèthe which contained a chapter discussing book preservation.[17] The first substantial work on the subject of book restoration was Alfred Bonnardot's Essai sur l'art de Restaurer les Estampes et les Livres, first published in Paris in 1846.[18][19][20] Until the late-nineteenth century, the preferred practice was to restore objects to newer or better condition with little regard to original style or composition.