X-ray spectrometry was used to analyze obsidian artifacts from Cerros, Belize, and from Yaxchilan, Chiapas, Mexico. The results of these analyses are compared to the results of analysis of obsidian geological sources using graphical and statistical methods in order to identify the probable source from which the obsidian for the artifacts came. These results are summarized along with the results of analysis by others of obsidian artifacts from several archaeological sites in the Lowland Maya area. Using these data, possible trade routes, and how they may have changed through time have been postulated. -- AATA