Society for American Archaeology meeting. Following an asphalt trail to ancient Olmec trade routes.
Pringle
Heather
H
D001106:Archaeology; D003132:Commerce / Q000266:history*; D049690:History, Ancient; D006801:Humans; D006838:Hydrocarbons; D008800:Mexico
D006838:Hydrocarbons; C006647:asphalt