For the Tengwesta Quenderinwa at least, the content was considered valid by Tolkien into the late 1960s, as evidenced by its agreement with linguistic material from that date. There are a few other works by Tolkien which are bundled with the TQ material which are also considered authoritative, but we can discuss those at a later date. It would be good to have an elvish linguistic expert such as someone from Eldamo to help review those works.
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