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Science 11 April 2008:
Vol. 320. no. 5873, p. 174
DOI: 10.1126/science.320.5873.174a
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News Focus

SOCIETY FOR AMERICAN ARCHAEOLOGY MEETING:
Following an Asphalt Trail to Ancient Olmec Trade Routes

Heather Pringle

At the Society for American Archaeology meeting, it was reported that the Olmec apparently mastered a sophisticated technique for making asphalt, crucial to sealing wooden boats, and they traded the valuable substance to others.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)