I'm starting to use Salt, and I've found the documentation frustrating.
As I expect the book is written by the same folks as the documentation, I'd be happy to try to provide some constructive feedback.
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Thanks for your interest in Salt Essentials. I'm not aware that technical reviewers are needed for this book, but thanks for the offer. On the catalog page for the book there is an area where errata can be submitted: http://www.oreilly.com/catalog/errata.... Have a good one!