Cobean, Robert H. <br/><br/>
High-Precision trace-element characterization of major mesoamerican obsidian sources and further analyses of artifacts from san lorenzo tenochtitlan, Mexico. 

 - Washington, DC-US :   Society for American Archaeology,   1991. 
 - p. 69-91 :   il 
 - trimestral 
 - Vol.2, no.1(Mar.1991) 
 - Latin American Antiquity ;   vol.2,no.1 .
 - Estados Unidos.   Society for American Archaeology. .