* "The first is called Map of the Founding of Tetepilco, and is a pictographic map which contains information regarding the foundation of San Andrés Tetepilco ...": San Andrés Tetepilco must have been Spanish, of course.
* "The second, the Inventory of the Church of San Andrés Tetepilco ...": Churches would be Spanish.
* "Tira of San Andrés Tetepilco, is a pictographic history ... comprising historical information regarding the Tenochtitlan polity from its foundation to the year 1603.": At least it seems to be about Aztecs.
Why were the first two books about Spanish topics but written in the local language? If Spanish people writing, wouldn't they write in Spanish? If Aztecs were writing, why would they care to record these things? I suppose the latter is plausible if they were absorbed into Spanish society.