While sales in the print trade segments shrank in August, e-book sales had another strong month, jumping 172.4%, to $39 million, according to the 14 publishers that report sales to the AAP’s monthly sales estimates. For the year-to-date, e-book sales were up 192.9%, to $263 million. AAP said that of the approximately 19 publishers that report trade sales, revenue in the January to August period was $2.91 billion, making the $263 million e-book sales 9.0% of trade sales. At the end of 2009, e-book sales comprised 3.3% of trade sales. The mass market segment, where sales were down 14.3% in the first eight months of 2009, represented 15.1% of trade sales through August.