"T"-numbering system 3114 B.C. Alfred Maudslay Ancient Explorers Ancient Writing August 13 Blog Calendar Round Constantine Rafinesque Copan David Stuart Decipherment Diego de Landa Discoveries Dresden Codex Eric Thompson Ernst Förstemann Hieroglyphs Linda Schele Maya Merle Greene Robertson Mesoamerica Palenque phonetic complement Piedras Negras stelae rebus Relation of the Things of Yucatan Tatiana Proskouriakoff Yuri Knorosov