New answers tagged dialects
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Most likely, there never was a complete list. In October 2014 Peter Constable wrote the following in an e-mail to the IETF-languages mailing list (emphasis mine):
While ISO 639-6 did get approved and published, the code table for 639-6 has never been made fully available in a usable manner. What data has been available has been looked at by lots of people ...
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