I recall seeing a while back a web page or article that gave a short  
list of some of the uses which reduplication serves in languages  
around the world -- e.g. to indicate plurality, diminutive,  
augmentative, intensive, frequentative, habitual, etc. Now I can't  
find it. Does anyone know where this list might be?

(I thought it was in the Wikipedia article on reduplication, but I  
don't see it, although they do give a few examples of its uses in  
various languages.)

Second, does anyone know of any theory dealing with reduplication  
where both the base and the reduplicant have some sort of *semantic*  
value and are related syntactically or morphologically? See, I don't  
even have the vocabulary to ask that question clearly. Unfortunately,  
I can't think of a really good example right now, but a contrived one  
would be _book book_, meaning a book *about* books.* In that phrase,  
both instances of _book_ carry semantic information which is related  
in a grammatical way, and the whole phrase _book book_ differs from  
_book_ in a substantially *semantic* way, rather than a purely  
grammatical way (like it would if reduplication could form plurals in  

* Admittedly, I don't think anyone would say "book book", except in  
cases of *another* kind of reduplication, where the meaning would be  
"an actual book on paper, as opposed to an ebook or audio book". I am  
not sure whether *that* kind of reduplication changes the semantics  
or not.

I suppose I could just call the phrase "book about books" an example  
of reduplication, since it doesn't seem to be integral to the  
definition that the base and reduplicant stand immediately adjacent;  
then I could avoid the mess about whether someone would say it.