@article {,
	title = {Trace Element Analysis of Obsidian Artifacts from the Andes: New perspectives on Pre-Hispanic economic interaction in Peru and Bolivia - LBL6343},
	year = {1977},
	note = {by Richard Burger and Frank Asaro.Includes bibliographical references (p. 80-88).Andes Geog},
	institution = {Lawrence Berkeley Laboratory},
	address = {Berkeley},
	keywords = {Andes},
	author = {Richard L. Burger and Asaro, Frank}
}