Based on sales for the week ending March 31, 2013

16. Lady Almina and the Real Downton Abbey
The Countess of Carnarvon, Broadway, $15.99, 9780770435622

17. Subliminal
Leonard Mlodinow, Vintage, $15, 9780307472250

18. Tiny Beautiful Things
Cheryl Strayed, Vintage, $14.95, 9780307949332

19. The 5 Love Languages
Gary Chapman, Northfield, $14.99, 9780802473158

20. Escape from Camp 14
Blaine Harden, Penguin, $15, 9780143122913

21. The Untethered Soul
Michael A. Singer, New Harbinger, $16.95, 9781572245372

22. The Immortal Life of Henrietta Lacks
Rebecca Skloot, Broadway, $16, 9781400052189

23. Prague Winter
Madeleine Albright, Harper Perennial, $15.99, 9780062030344

24. Nothing to Lose, Everything to Gain
Ryan Blair, Portfolio, $16, 9781591845997

25. Paris in Love
Eloisa James, Random House , $15, 9780812981902

26. Why Be Happy When You Could Be Normal?
Jeanette Winterson, Grove Press, $15, 9780802120878

27. Point Your Face at This
Demetri Martin, Grand Central, $12.99, 9781455512058

28. F in Exams
Richard Benson, Chronicle , $9.95, 9780811878319

29. The Happiness Project
Gretchen Rubin, Harper, $14.99, 9780061583261

30. ObamaCare Survival Guide
Nick J. Tate, Humanix, $19.95, 9780893348625

31. The Gifts of Imperfection
Brene Brown, Hazelden, $14.95, 9781592858491

32. Paris: A Love Story
Kati Marton, S&S, $14.99, 9781451691559

33. Lucky Peach, Issue 6
David Chang (Ed.), McSweeney's , $12, 9781938073465

34. The Presidents Club
Nancy Gibbs, Michael Duffy, S&S, $18, 9781439127728

35. Steal Like an Artist
Austin Kleon, Workman, $10.95, 9780761169253

36. Why Does the World Exist?
Jim Holt, Liveright , $16.95, 9780871403599

37. The Devil in the White City
Erik Larson, Vintage, $16, 9780375725609

38. This Explains Everything
John Brockman (Ed.), Harper Perennial, $15.99, 9780062230171

39. What to Expect When You're Expecting
Heidi Murkoff, Sharon Mazel, Workman, $14.95, 9780761148579

40. Heaven Is for Real
Todd Burpo, Thomas Nelson, $16.99, 9780849946158

41. Revelations
Elaine Pagels, Penguin Books, $16, 9780143121633

42. Team of Rivals
Doris Kearns Goodwin, S&S, $21, 9781451688092

43. The Hare With Amber Eyes
Edmund de Waal, Picador, $16, 9780312569372

44. Thinking, Fast and Slow
Daniel Kahneman, FSG, $16, 9780374533557

45. Rand McNally 2013 Road Atlas
Rand McNally, $13.95, 9780528006227

46. F for Effort!
Richard Benson, Chronicle, $9.95, 9781452113227

47. Season of the Witch
David Talbot, Free Press, $16, 9781439108246

48. Citizens of London
Lynne Olson, Random House, $17, 9780812979350

49. The Power of Now
Eckhart Tolle, New World , $15, 9781577314806

50. Gifts of the Crow
John Marzluff, Tony Angell, Atria, $15, 9781439198742