Based on sales for the week ending August 7, 2011

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

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

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

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

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

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

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

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

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

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

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

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

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

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

30. The Tipping Point
Malcolm Gladwell, Back Bay, $15.99, 9780316346627

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

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

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

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

35. The Shallows
Nicholas Carr, Norton, $15.95, 9780393339758

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

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

38. A Moveable Feast
Ernest Hemingway, Scribner, $15, 9781439182710

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

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

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

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

43. Too Big to Fail
Andrew Ross Sorkin, Penguin, $18, 9780143120278

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

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

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

47. My Horizontal Life
Chelsea Handler, Bloomsbury, $14.95, 9781582346182

48. Tuesdays With Morrie
Mitch Albom, Broadway, $13.99, 9780767905923

49. Food Rules
Michael Pollan, Penguin, $11, 9780143116387

50. Eating Animals
Jonathan Safran Foer, Back Bay, $14.99, 9780316069885