@article {, title = {Determining the Geological Provenance of Obsidian Artifacts from the Maya Region: A test of the efficacy of visual sourcing}, journal = {Latin American Antiquity}, volume = {11}, number = {3}, year = {2000}, pages = {269-282}, author = {Braswell, Geoffrey E. and Clark, John E. and Aoyama, Kazuo and McKillop, Heather I. and Michael D. Glascock} }