TY - BOOK AU - Harrison, K. David TI - When languages die : the extinction of the world's languages and the erosion of human knowledge SN - 9780195372069 SN - 200604530 U1 - 417.7 HR PY - 2007/// CY - Oxford PB - Oxford University Press KW - Language obsolescence N1 - Includes bibliographical references (p. 263-283) and index ER -