Based on sales for the week ending July 24, 2011

16. The Disappearing Spoon
Sam Kean, Back Bay, $14.99, 9780316051637

17. Four Fish
Paul Greenberg, Penguin, $16, 9780143119463

18. Three Cups of Deceit
Jon Krakauer, Anchor, $9.95, 9780307948762

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

20. Lucky Peach, Issue 1: Ramen
Chris Ying (Ed.), McSweeney's, $10, 9781936365463

21. The Big Short
Michael Lewis, Norton, $15.95, 9780393338829

22. Into the Wild
Jon Krakauer, Anchor, $14.95, 9780307387172

23. Sex at Dawn
Christopher Ryan, Cacilda Jetha, Harper Perennial, $15.99, 9780061707810

24. Medium Raw
Anthony Bourdain, Ecco, $15.99, 9780061718953

25. The Last Stand
Nathaniel Philbrick, Penguin, $18, 9780143119609

26. Operation Mincemeat
Ben Macintyre, Broadway, $15, 9780307453280

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

28. How to Read Literature Like a Professor
Thomas C. Foster, Harper, $14.99, 9780060009427

29. Lunch in Paris
Elizabeth Bard, Back Bay, $13.99, 9780316042789

30. The Sweet Life in Paris
David Lebovitz, Broadway, $14, 9780767928892

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

32. The Tiger
John Vaillant, Vintage, $15, 9780307389046

33. Thank You Notes
Jimmy Fallon, Grand Central, $12, 9780892967414

34. Super Natural Every Day
Heidi Swanson, Ten Speed Press, $23, 9781580082778

35. Freakonomics
Steven D. Levitt, Stephen J. Dubner, Harper Perennial, $15.99, 9780060731335

36. Same Kind of Different as Me
Ron Hall, Denver Moore, Thomas Nelson, $16.99, 9780849919107

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

38. The Dirty Life
Kristin Kimball, Scribner, $15, 9781416551614

39. War
Sebastian Junger, Twelve, $15.99, 9780446556224

40. Night
Elie Wiesel, FSG, $9.95, 9780374500016

41. Blink
Malcolm Gladwell, Back Bay, $15.99, 9780316010665

42. The Murder Room
Michael Capuzzo, Gotham, $17, 9781592406357

43. Superfreakonomics
Steven D. Levitt, Stephen J. Dubner, Harper Perennial, $15.99, 9780060889586

44. Last Call
Daniel Okrent, Scribner, $17, 9780743277044

45. Packing for Mars
Mary Roach, Norton, $15.95, 9780393339918

46. Half a Life
Darin Strauss, Random House, $13, 9780812982534

47. Drive
Daniel H. Pink, Riverhead, $16, 9781594484803

48. The Lost Cyclist
David V. Herlihy, Mariner, $14.95, 9780547521985

49. What the Dog Saw
Malcolm Gladwell, Back Bay, $16.99, 9780316076203

50. The Omnivore's Dilemma
Michael Pollan, Penguin, $17, 9780143038580