30% of eBooks in the US do Not Use ISBN

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This is just one of the findings of the “January 2015 Author Earnings Report” by an independent (and non-profit) web survey. It is not at all Nielsen data, which covers only a fraction of e-book and book sales, and does not reveal the true numbers of purchases and author earnings. However these Nielsen data is publicized widely and people are believing these (wrong) numbers. Not to mention that overall bestseller lists are often manipulated. Until now there were no true numbers available as...