Here is a bunch of extended mind papers in the Spring issue of Teorema.
Extended Mind: Special Section in TEOREMA
active externalism, active perception, Andy Clark, cognition, cognition in the wild, cognitive science, cognitive systems, Cognitive Systems and the Extended Mind, collective intentionality, complex adaptive systems, complexity, consciousness, david chalmers, extended cognitive systems, extended mind, Julian Kiverstein, Miko Farina, philosophy of mind, philosophy of psychology, situated cognition