Sheets, Payson. <br/><br/>
Obsidian sources and elemental analyses of aritfacts in southern mesoamerica and the Northern Intermediate Area. 

 - Washington-US :   Society for American Archaeology,   1990. 
 - p. 144-158 :   il. 
 - Trimestral 
 - Vol. 55, no, 1 (Jan 1990) 
 - American Antiquity ;   vol. 55 no. 1 .
 - Washington.   Society for American Archaeology. .
<br/><br/> Artículo dentro de: Reports. 
<br/><br/><br/>Inglés.