Facing some harder comparisons, e-book sales posted their slowest growth rates in 2010 in October. Still, sales jumped 112.4%, to $40.7 million, from the 14 publishers who reported results to the AAP’s monthly sales program. For the first 10 months of the year, e-book sales from the 14 houses rose 171.3%, to $345.3%, 8.7% of the trade sales of reporting publishers. The three adult categories all had declines in October and for the 10 months of 2010 adult hardcover sales from 17 reporting houses fell 7.7%, and sales from 9 mass market houses were down 14.3%. Sales of trade paperbacks from 19 publishers were flat.