The lost golden age of language diversity

Tens of thousands of languages may have existed between 1,000 and 3,000 years ago - and their decline began well before European colonial expansion

by Damian E. Blasi, Claire Bowern, Russell D. Gray and Sandra Jacob

https://www.mpg.de/26871018/the-lost-golden-age-of-language-diversity

Books about Comparative linguistics at PG: https://www.gutenberg.org/ebooks/subject/19696

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