Illustrations from Carlo T.E. Gay & Frances Pratt “Olmec Hieroglyphic Writing,” Archaeology 26:4 (October 1973): 278-288
 
Upper left: Pictograph 15, Chalcacingo Upper right: Incised stone celt, Guerrero
Center left: Eight cupules on a megalith, Xochipala Center right: Incised stone tablet, Guerrero
Lower left: Eight sign ceramic roller stamp, Tlatilco Lower right: Three sign roller stamp, Tlatilco

 

 
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