Hughes, Richard E. <br/><br/>
Another look at hopewell obsidian studies. 

 - Washington-US :   Society for American Archaeology,   1992. 
 - p. 515-523 :   il. 
 - Trimestral 
 - Vol. 57, no, 3 (Jul 1992) 
 - American Antiquity ;   vol. 57 no. 3 .
 - Washington.   Society for American Archaeology. .
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