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Pros
Pro Some material available for free
Three chapters of the book are available as a free download.
Pro Comprehensive resource
D3.js in Action is 352 pages long and provides a strong foundation in D3.js before providing you with a comprehensive list of ways it can be used.
Cons
Con Intimidating for beginners
Due to the heavy volume of information packed into the book, it can be a discouraging place to start for someone new to D3.js.