@inbook {, title = {A Review of Twentieth-Century Mesoamerican Obsidian Studies}, booktitle = {Mesoamerican Lithic Technology: Experimentation and Interpretation}, year = {2003}, pages = {15-54}, publisher = {University of Utah Press}, organization = {University of Utah Press}, address = {Salt Lake City}, author = {Clark, John E.}, editor = {Hirth, Kenneth G.} }