 1989 "Evaluating the Role of a Western Corridor in the Peopling of the Americas", (communication prepared for the Circum-Pacific Prehistory Conference, Seattle, Washington, August 1989).
 1989 "Evaluating the Role of a Western Corridor in the Peopling of the Americas", (comm. prép. pour la Circum-Pacific Prehistory Conference, Seattle, Washington, August 1989).