Extended Paperback Nonfiction Based on sales from the week ending July 20, 2003 16. Complications Atul Gawande, 0312421702, Picador, $13 17. A Thousand Days in Venice Marlena Blasi, 0345457641, Ballantine, $12.95 18. What to Expect When You're Expecting Heidi E. Murkoff, Arlene Eisenberg, Sandee Hathaway, 0761121323, Workman, $13.95 19. Ciao, America! Beppe Severgnni, 0767912365, Broadway, $12.95 20. Self Matters Phillip C. McGraw, Ph.D., 0743227255, Free Press, $14 21. Lucky Alice Sebold, 0316096199, Back Bay, $11.95 22. Into the Wild Jon Krakauer, 0385486804, Anchor, $12.95 23. Guns, Germs, and Steel Jared Diamond, 0393317552, Norton, $16.95 24. Tuxedo Park Jennet Richards Conant, 0684872889, S&S, $14 25. The Sweet Potato Queens' Big-Ass Cookbook and Financial Planner Jill Conner Browne, 060980877X, Three Rivers, $13.95 26. The Botany of Desire Michael Pollan, 0375760393, Random House, $13.95 27. Me Talk Pretty One Day David Sedaris, 0316776963, Little Brown, $14.95 28. Tuesdays with Morrie Mitch Albom, 076790592X, Broadway, $11.95 29. A People's History of the United States Howard Zinn, 0060528370, Perennial, $18.95 30. A Problem From Hell Samantha Power, 0060541644, Perennial, $17.95 31. A Walk in the Woods Bill Bryson, 0767902521, Broadway, $13.95 32. The Sweet Potato Queens' Book of Love Jill Conner Browne, 0609804138, Three Rivers, $12.95 33. Autobiography of a Fat Bride Laurie Notaro, 037576092X, Villard, $12.95 34. Rand McNally 2003 Road Atlas Rand McNally, 0528844695, Rand McNally, $11.95 35. Rich Dad, Poor Dad Robert Kiyosaki, 0446677450, Warner, $16.95 36. A Child Called "It" Dave Pelzer, 1558743669, HCI, $9.95 37. Founding Brothers Joseph J. Ellis, 0375705244, Vintage, $14 38. Hold Your Horses Bonnie Timmons, 0761115366, Workman, $10.95 39. A Girl Named Zippy Haven Kimmel, 0767905318, Broadway, $12.95 40. How to Lose Friends and Alienate People Toby Young, 0306812274, Da Capo, $14.95 41. Salt Mark Kurlansky, 0142001619, Penguin, $15 42. 30-Minute Meals 2 Rachael Ray, 1891105108, Lake Isle, $16.95 43. What Went Wrong? Bernard Lewis, 0060516054, Perennial, $12.95 44. What Every Person Should Know about War Chris Hedges, 0743255127, Free Press, $11 45. The Color of Water James McBride, 1573225789, Riverhead, $14 46. John Adams David McCullough, 0743223136, Touchstone, $18.95 47. Naked David Sedaris, 0316777730, Back Bay, $14.95 48. The Sibley Field Guide to Birds of Western North America David Allen Sibley, 0679451218, Knopf, $19.95 49. Benjamin Franklin Edmund S. Morgan, 0300101627, Yale U., $16 50. Blue Latitudes Tony Horwitz, 0312422601, Picador, $15