i just grabbed that quickly off wiki, however as a history buff interested in the Americas, I have several books in my library that reference the codices. Unfortunately the Spanish inquisition were at their peak about the time of the new world expeditions, and they would not tolerate the images that appeared to be the languages of devils and demons to exist. The whole histories of civilizations gone up in smoke. It ranks right up there with the decision given by Pope Nicolas V in a papal bull to the Portuguese after Antao Goncalves brought Africans he had traded for back to Portugal. Sometimes people just screw up royally .
Interesting - that is a big gap in my knowledge. My historical knowledge is mainly focused on the Indo-European and Semitic and Elamo-Sumerian-Dravidian space (overlapping spaces) .
I really thought that the MesoAmericans had only stone pictographs...