Contents Two Newly Discovered Sources of Archaeological Obsidian in the Archaeological and Social Implications by M Steven Shackley; A Sinagua Architectural Adaptation at New Caves Arizona by Kathryn A Kamp and John C Whittaker; Paleoindian Archaeology in Northern Sonora A Review and Update by Edmund P Gaines; Possible Manso Occupation at Site LA129533 Near El Paso Texas; etc