Thin folio. 39, (1) pp. White vellum spine; brown paper over boards, printed title label on the upper board. Finely printed on handmade paper in the traditional Spanish size. ('al tamaño español tradicional'). Illustrated with tipped-in reproductions of pages of the period. According to the colophon, one of 50 copies only. In fine condition. A much needed description of the state of printing in New Spain at the end of the 16th century and beginning of the 17th by a modern Master Printer of México. .