Previous editions of "HTML5: The Definitive Guide"?

HTML5: The Definitive Guide, 7th Edition (978-1-4493-0259-7)... Is there a "6th Edition" that I can pick up somewhere?

I don't want to wait another 9 months for the latest edition to come out. I need a good HTML5 reference *now*. Google came up empty when I searched for "HTML5: The Definitive Guide, 6th Edition". Links or ISBNs for any previous editions would be very helpful. Thanks!
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