According to the latest Association of American Publishers (AAP) net sales revenue report, the adult mass paperback category declined nearly 38 percent (to $37.2 million) in October compared to the same period last year.

At the same time, adult hardcover sales dropped 17 percent (to $213.3 million) while eBook sales increased 81 percent (to $72.8 million). Above, we’ve embedded the AAP’s sales chart for the year-to-date–including a 4.5 percent decline in total trade revenues the year so far.

Here’s more from the release: “For the second month of the Fall sales season but ahead of the traditional holiday purchasing window, several categories showed declines while others, particularly those which have seen continuing growth over the past year, have maintained momentum … Details for the above follow.  The October report represents data provided by 80 publishers and is produced by the Association of American Publishers.”