8 Famous Books Still Only on Paper Including 'To Kill a Mockingbird' and 'Catcher in the Rye' By Dustin Lushing, Newser Staff Posted Mar 10, 2012 9:50 AM CST 8 comments Comments Even Harry Potter isn't digital yet. (Shutterstock) (Newser) – The e-book market has spiked from 0.6% in 2008 to 6.4% in 2010, or $878 million in sales, yet you still won't be able to find certain hugely popular books in the new format. The Street rounded up a list of eight classics that can be found only on dead trees. The Harry Potter series, by JK Rowling: The wizard saga that's sold 450 million copies was supposed to be on your Kindle last year but was hit with unexpected delays. It might show up sometime this year. To Kill a Mockingbird, by Harper Lee: The Pulitzer-prize winning story that nearly every American schoolchild has read will probably not be heading to your iPad soon. Lee, 85, apparently isn't interested. The Catcher in the Rye, by JD Salinger: Reclusive and guarded Salinger rejected every form of adaption of his novel, including a movie deal with Spielberg. Don't hold your breath for an e-book. One Hundred Years of Solitude, by Gabriel Garcia Marquez: The 1967 story of a Colombian family is actually available in e-book form, but only in Spanish. See the full list here.