The indians had those books, the famous codex (codices in spanish). But the franciscan monks who came with the conquistadores, zealous in their evangilist job had no better idea than burning those eretic wrotes. The archaelogists who made excavations and tried to rebuild the mayan history, were amazed by the details they discovered about this ancient refined civilization, known through the glyves to have developed cruel mores and whose legends credit it a mysterious past.