eBooks Made Up 12% of ISBNs Registered in the US in 2011

Late last week Amazon announced for the US and world market. Neat story, and I followed it up that with a short post about the 25% of Spanish ISBNs that went to ebooks in March.I promised at the time that I would try to get some figures for the US market. I thought it would be good to give the Spanish numbers some context, but it took my friend’s contact at Bowker until Monday to get the