OT: Good Books?

I've hit a bit of a roadblock on my conlang work, due mainly to lack of
sleep, but I hate to not do *something* in regards to conlanging....
So, can anyone suggest any good books, especially for the linguistically
challenged, that might help with conlanging?
I've read some basic, introductory texts on linguistics and I have a
book on language change in my reading queue, but I'd welcome any
suggestions.  Especially, any *fiction* that features good conlang
fodder, excepting, of course, Tolkien.  I've already read that! ^_^

Thanks,
Jim
--
"What is impossible today may suddenly become possible tomorrow."
- Thomas Merton

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