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Title: online version
Review: The authoors have made this book available for reading online under a creative commons license at:http://dreamsongs.com/IHE/IHE.htmlThis is very generous of the authors and thankfully is happening more and more with FOSS related books. - see Karl Fogels "Producing Open source" or Lessigs "Free Culture".By all means buy the hardcopy if you like the online version. Personally I'm more likely to want to support an author who is good enough to make the material available online.
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