Based on sales for the week ending April 22, 2012

16. Empire of the Summer Moon
S.C. Gwynne, Scribner, $16, 9781416591061

17. Lucky Peach Issue 3
David Chang (Ed.), McSweeney's, $12, 9781936365487

18. The Social Animal
David Brooks, Random House, $16, 9780812979374

19. The Hunger Pains
The Harvard Lampoon, Touchstone, $13.99, 9781451668209

20. The Devil in the White City
Erik Larson, Vintage, $15.95, 9780375725609

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

22. Cleopatra
Stacy Schiff, Back Bay, $16.99, 9780316001946

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

24. The Warmth of Other Suns
Isabel Wilkerson, Vintage, $16.95, 9780679763888

25. The Glass Castle
Jeannette Walls, Scribner, $16, 9780743247542

26. Wreck This Journal
Keri Smith, Perigee, $13.95, 9780399533464

27. Zeitoun
Dave Eggers, Vintage, $15.95, 9780307387943

28. To Marry an English Lord
Gail MacColl, Carol McD. Wallace, Workman, $15.95, 9780761171959

29. Unfamiliar Fishes
Sarah Vowell, Riverhead, $16, 9781594485640

30. The Man Who Quit Money
Mark Sundeen, Riverhead, $15, 9781594485695

31. The Grand Design
Stephen Hawking, Leonard Mlodinow, Bantam, $18, 9780553384666

32. Titanic, First Accounts
Tim Maltin (Ed.), Penguin, $16, 9780143106623

33. Maphead
Ken Jennings, Scribner, $15, 9781439167182

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

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

36. The Dressmaker of Khair Khana
Gayle Tzemach Lemmon, Harper Perennial, $14.99, 9780061732478

37. The Best Advice I Ever Got
Katie Couric, Random House Trade, $15, 9780812982589

38. Act Like a Lady, Think Like a Man
Steve Harvey, Amistad Press, $13.99, 9780061728983

39. Eat to Live
Joel Fuhrman, Little Brown, $15.99, 9780316120913

40. This Is a Book
Demetri Martin, Grand Central, $14.99, 9780446539692

41. The Information
James Gleick, Vintage, $15.95, 9781400096237

42. The Four Agreements
Don Miguel Ruiz, Amber-Allen, $12.95, 9781878424310

43. Malcolm X
Manning Marable, Penguin, $18, 9780143120322

44. Kitty Cornered
Bob Tarte, Algonquin, $13.95, 9781565129993

45. To End All Wars
Adam Hochschild, Mariner, $15.95, 9780547750316

46. At Home
Bill Bryson, Anchor, $15.95, 9780767919395

47. Rand McNally Road Atlas 2012
Rand McNally, $13.95, 9780528003363

48. The Emperor of All Maladies
Siddhartha Mukherjee, Scribner, $18, 9781439170915

49. Moby-Duck
Donovan Hohn, Penguin, $16, 9780143120506

50. The Elements
Theodore Gray, Black Dog & Leventhal, $19.95, 9781579128951