Amazon claims that, during that period, 143 e-books were sold for every 100 hardcover books, including hardcovers for which there is no digital edition; and during late June and early July, sales rose to 180 digital books for every 100 hardcovers.
I have this in my truck and absolutely love it, especially when using Apple Maps.
I am so sick and tired of buying every single 'mildew resistant' shower curtain I can find.