The book is devoted to linguistic and phonetic analysis of some undescribed and endangered languages. It collects the Proceedings of the international conference on "Undescribed and endangered languages: the preservation of linguistic diversity" held in University of Tuscia (Viterbo, Italy), on September 29, 2005. Papers are by Roberto Ajello (Pisa), Amedeo De Dominicis (Viterbo), Maurizio Gnerre (Napoli), Antonino Melis (N'Djamena). It will appeal to linguists, phoneticians and phonologists as a contribution to the debate. It discusses and it will be welcomed by a wide range of students and researchers as an ideal overview of recent works.