Antonio de León y Gama, Descripción histórica y cronológica de las dos piedras (Mexico, 1792)

The book a criollo astronomer of Mexico City wrote about two Mexica monuments dug out of the main square in 1790, arguing from Nahuatl manuscripts and codices in his own hands that their makers had geometry, mechanics and a corrected luni-solar calendar. It records the viceregal order that preserved one stone, the informal handover of the other, and the reason its censor wanted the argument made.