These tutorials have been expanded into a book, Interactive Data Visualization for the Web, published by O’Reilly in March 2013. Purchase the ebook and print editions from O’Reilly. A free, online version includes interactive examples. Download the sample code files and sign up to receive updates by email.
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These tutorials have been generously translated to Japanese (日本語版) by Hideharu Sakai and Spanish (Español) by Gabiel Coch.