Shaffer, Brian S. <br/><br/>
How many epidermal ridges per linear centimeter? comments on possible pre clovis human friction skin prints from pendejo cave. 

 - Washington-US :   Society for American Archaeology,   1997. 
 - p. 559-560 :   il. 
 - Trimestral 
 - Vol. 62, no, 3 (Jul 1997) 
 - American Antiquity ;   vol. 62 no. 3 .
 - Washington.   Society for American Archaeology. .
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