Daniel Pierce University of Missouri-Columbia No description specified. 1-3 (3 Records) Documents Finding Class from the Glass: Obsidian source as a costly signal (2016) The Obsidian Trail: A GIS model for obsidian trade routes in the West Mexican Aztatlán Tradition (AD 900-1350) (2017) Preliminary Results on Regional Postclassic Aztatlán Obsidian Usage Patterns (2015)