TY - BOOK AU - Clark,D.S. TI - Sign Levels: Language and Its Evolutionary Antecedents T2 - Philosophical Studies Series Book 96 SN - 9781402016509 U1 - 401.41 CLA PY - 2012/// CY - Netherland PB - Kluwer Academic Publisher KW - Philosophy & theory N1 - Bib and Ref ER -