 Beristáin at first intended to republish Eguiara, completing the alphabet by means of sketches and notes left by the author, but, as he proceeded to carry out the idea, he found that it would be preferable to compose an independent bibliography, incorporating in it the material Eguiara had collected.of Beristain's "Biblioteca" contains many errors in names and dates.Taking into account the time when he wrote, and the distances from sources and their frequent inaccessibility, it has been considered by many as a monumental work.