TY - BOOK AU - Clarke, D. S. AU - TI - Sign levels: language and its evolutionary antecedents SN - 1-4020-1650-6 U1 - 164.02 PY - 2003/// CY - Dordrecht PB - Kluwer Academic Publishers KW - Semiotic- Methodology KW - Comsigns KW - Language- Evolution KW - Sign levels ER -