31 Burger, Richard L., Michael D. Glascock 2002 Tracking the Source of Quispisisa Type Obsidian from Huancavelica to Ayacucho Isbell, William Harris Silverman, Helaine Andean archaeology I: variations in sociopolitical organization New York Plenum 341-368 0306467720 UCLA YRL F3429 .A5517 20 Indians of South America Peru Antiquities, Indians of South America Andes Region Antiquities, Peru -Antiquities., Andes Region Antiquities. edited by William H. Isbell and Helaine Silvermanill., maps ; 24 cm