I found the book in England this morning for $83 (40 GPB!), still not cheap but could not resist, it is the most on-topic book I ever met. When I have it we may arrange to scan the rest of it (probably in september though...) It seems he also wrote "Electronics in Music" but I only find it around $250! Here are two descriptions (that differ a bit): http://www.isbn.pl/A-F-C-Judd/
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Re: "electronic music and musique concrete" by Judd
2007-07-13 by Fernando de Izuzquiza