The best book on punctuation that I have read is M. B. Parkes.  Pause and 
Effect: An Introduction to the History of Punctuation in the West.   Berkeley/Los 
Angeles, CA. University of California Press, 1993.   ESPECIALLY if you are 
interested in the history of punctuation, you should get this.   Be warned in 
advance, though, it is an extremely scholarly book, written by a lecturer in 
Paleography, Oxford University.   (I found it readable, though, and MUCH worth 
reading.)   Also be advised that it is extremely expensive, but perhaps you can 
find one in your local university library, as I did.

Ed Schuster

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