Who is the Publisher? Check the ISBN!

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Have you been wondering about thenumerous news stories about “declining e-book sales” during the last couple of months? Well only those who have an ISBN, and only those from certain book stores,online retailers and large trade publishers are counted.

30% of alle-books being purchased in the United States do not use ISBN numbers and are invisible to the industry’s official market surveys and reports. Which also means: all the ISBN-based estimates of market share reported by Bowker, AAP, BIS...