Based on sales for the week ending January 15, 2012

16. American Sniper
Chris Kyle, et al., Morrow, $26.99, 9780062082350

17. Through My Eyes
Tim Tebow, Harper, $26.99, 9780062007285

18. Jack Kennedy
Chris Matthews, S&S, $27.50, 9781451635089

19. Arguably
Christopher Hitchens, Twelve, $30, 9781455502776

20. Blue Nights
Joan Didion, Knopf, $25, 9780307267672

21. Guinness World Records 2012
Guinness, $28.95, 9781904994671

22. Is Everyone Hanging Out Without Me? (And Other Concerns)
Mindy Kaling, Crown Archetype, $25, 9780307886262

23. A History of the World in 100 Objects
Neil MacGregor, Viking, $45, 9780670022700

24. Emotional Equations
Chip Conley, Free Press, $24, 9781451607253

25. Greedy Bastards
Dylan Ratigan, S&S, $25, 9781451642223

26. Food Rules
Michael Pollan, Maira Kalman (Illus.), Penguin Press, $23.95, 9781594203084

27. Into the Silence
Wade Davis, Knopf, $32.50, 9780375408892

28. Destiny of the Republic
Candice Millard, Doubleday, $28.95, 9780385526265

29. Taking People With You
David Novak, Portfolio, $25.95, 9781591844549

30. Distrust That Particular Flavor
William Gibson, Putnam, $26.95, 9780399158438

31. Roger Williams and the Creation of the American Soul
John M. Barry, Viking, $35, 9780670023059

32. Plenty
Yotam Ottolenghi, Chronicle, $35, 9781452101248

33. Smart Trust
Stephen R. Covey, et al., Free Press, $27, 9781451651454

34. December 1941
Craig Shirley, Thomas Nelson, $24.99, 9781595554574

35. The Dukan Diet
Pierre Dukan, Crown Archetype, $26, 9780307887962

36. Spontaneous Happiness
Andrew Weil, Little Brown, $27.99, 9780316129442

37. A Universe from Nothing
Lawrence Krauss, Free Press, $24.99, 9781451624458

38. Jerusalem: The Biography
Simon Sebag Montefiore, Knopf, $35, 9780307266514

39. Back to Work
Bill Clinton, Knopf, $23.95, 9780307959751

40. The Magic Room
Jeffrey Zaslow, Gotham, $27, 9781592406616

41. The Greater Journey
David McCullough, S&S, $37.50, 9781416571766

42. Hedy's Folly
Richard Rhodes, Doubleday, $26.95, 9780385534383

43. Deliciously G-Free
Elisabeth Hasselbeck, Ballantine, $30, 9780345529381

44. New York Diaries: 1609 to 2009
Teresa Carpenter (Ed.), Modern Library, $26, 9780679643326

45. The Last Holiday
Gil Scott-Heron, Grove Press, $25, 9780802129017

46. 1493
Charles C. Mann, Knopf, $30.50, 9780307265722

47. The Eighty-Dollar Champion
Elizabeth Letts, Ballantine, $26, 9780345521088

48. One Thousand Gifts
Ann Voskamp, Zondervan, $16.99, 9780310321910

49. Rome: A Cultural, Visual, and Personal History
Robert Hughes, Knopf, $35, 9780307268440

50. Woolgathering
Patti Smith, New Directions, $18.95, 9780811219440