http://www.amazon.co.uk/Dont-Sleep-There-are-Snakes/dp/18466...
or indeed, any context. It's a fabulous book about the good and bad in societies untouched by civilization, and about one man's attempts to understand a language with no reference points. And his struggle with his Christian mission, ending up in his atheism. It's got everything, and would make a great film.
There's quite a bit about the language, but the backstory of Daniel going over as a missionary and losing his faith (and family) while trying to convert a happy people in no need of religion is stunning.
All of that being said, the study of language is very important, and the differences that exist should be recorded for scientific study. Maybe it even makes sense to preserve the real outlying communities (http://www.amazon.com/Dont-Sleep-There-Are-Snakes/dp/0307386...) by forcibly cutting them off from the global economy.
But major languages (English, Spanish, Portuguese) are redundant standards that should be consolidated ASAP.
