sarah weinman, i know thi this t is difficult to find, but lorin hillebrand, best selling nonfiction book of 2011 according to the new york times. todd burpo, "heaven is for real," best selling on fiction e-book. and print list as well. you have any idea how many copies of those books got sold? >> it's funny you mention, i feel like especially as the digital market share keeps rising, finding statistics that one can rely on it becomes increasing more difficult. i'll give an example. nielsen has a service called bookscan which tracks anywhere from about 70-75% of print scales. now, even as far back as i think three years ago when kindle the still new and e-book sales are barely in the single digits, one could look to bookscan at least a pretty good snapshot of how his book was selling. i mean, it depended on what outlook and they were reporting. they still don't report on certain ones. but again it was at least a fairly good relative snapshot. but because nielsen bookscan does not record digital sales, they promised that they will, but so far that has not come to fruition. as a result