It was not until the nineteenth century that the work of men such as John Lloyd Stephens, Eduard Seler and Alfred P. Maudslay, and of institutions such as the Peabody Museum of Archaeology and Ethnology of Harvard University, led to the reconsideration and criticism of the European sources.
Det var først i 19. århundrede, at John Lloyd Stephens, Eduard Seler og Alfred P. Maudslay, og institutioner såsom Peabody Museum of Harvard University's arbejde, førte til en genovervejelse og kritik af de europæiske kilder.