The Biblioteca Digital Mexicana is a multi-institutional initiative to create a digital collection of historical documents from Mexico from 500 A.D. to 1949. The documents range from pre-hispanic codices such as the Mixtec Codice Colombino from the 12th century, to the original manuscript of the Plan de Ayala written in 1911 by Emiliano Zapata and Otilio Montano, one of the most important documents of the Mexican Revolution.