Please assure me that when you are speaking of the books being written in Noldorin that you mean they are written in Quenyan, as opposed to the common Elvish tongue of this period which would be Sindarin.
From the Ardalambrion site:
Quote:
Quenya or High-elven is the most prominent language of the Amanya branch of the Elvish language family. In Aman there were two dialects of Quenya, Vanyarin and Noldorin. For historical reasons, only the latter was used in Middle-earth.
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Here is the entire article on Quenya:
QUENYA