Based on sales for the week ending March 31, 2013

16. Canada
Richard Ford, Ecco Press, $15.99, 9780061692031

17. The Sense of an Ending
Julian Barnes, Vintage, $14.95, 9780307947727

18. Wool
Hugh Howey, S&S, $15, 9781476733951

19. World War Z
Max Brooks, Three Rivers, $14.95, 9780307346612

20. Fifty Shades of Grey
E.L. James, Vintage, $15.95, 9780345803481

21. The Expats
Chris Pavone, Broadway, $15, 9780770435721

22. 1Q84
Haruki Murakami, Vintage, $16.95, 9780307476463

23. Calico Joe
John Grisham, Bantam, $14, 9780345536648

24. Cloud Atlas
David Mitchell, Random House, $15, 9780812984415

25. The Forgotten
David Baldacci, Grand Central , $14.99, 9781455523153

26. The Limpopo Academy of Private Detection
Alexander McCall Smith, Anchor, $14.95, 9780307472991

27. What We Talk About When We Talk About Anne Frank
Nathan Englander, Vintage, $15, 9780307949608

28. The Art of Fielding
Chad Harbach, Back Bay, $14.99, 9780316126670

29. The Art of Hearing Heartbeats
Jan-Philipp Sendker, Other Press, $14.95, 9781590514634

30. The Gods of Gotham
Lyndsay Faye, Berkley , $16, 9780425261255

31. Swamplandia!
Karen Russell, Vintage, $14.95, 9780307276681

32. In One Person
John Irving, S&S, $15.99, 9781451664133

33. The Age of Miracles
Karen Thompson Walker, Random House, $15, 9780812982947

34. The Silver Linings Playbook
Matthew Quick, Sarah Crichton Books, $15, 9780374533571

35. Fifty Shades Freed
E.L. James, Vintage, $15.95, 9780345803504

36. Billy Lynn's Long Halftime Walk
Ben Fountain, Ecco, $14.99, 9780060885618

37. A Land More Kind Than Home
Wiley Cash, Morrow, $14.99, 9780062088239

38. Ready Player One
Ernest Cline, Broadway, $14, 9780307887443

39. Fifty Shades Darker
E.L. James, Vintage, $15.95, 9780345803498

40. The 100-Year-Old Man Who Climbed Out the Window and Disappeared
Jonas Jonasson, Hyperion, $15.99, 9781401324643

41. Sharp Objects
Gillian Flynn, Three Rivers, $14, 9780307341556

42. The Buddha in the Attic
Julie Otsuka, Anchor, $13.95, 9780307744425

43. The Tiger's Wife
T?a Obreht, Random House, $15, 9780385343848

44. The Kitchen House
Kathleen Grissom, Touchstone, $16, 9781439153666

45. Dark Places
Gillian Flynn, Three Rivers, $14, 9780307341570

46. Light Between Oceans
M.L. Stedman, Scribner , $16, 9781451681758

47. The Hobbit
J.R.R. Tolkien, Mariner, $13.95, 9780547928227

48. The Brief Wondrous Life of Oscar Wao
Junot Diaz, Riverhead, $16, 9781594483295

49. The Uninvited Guests
Sadie Jones, Harper Perennial, $14.99, 9780062116512

50. The Alchemist
Paulo Coelho, HarperOne, $14.99, 9780061122415