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Photo Credits
- 1. (c) Per Verdonk, some rights reserved (CC BY-NC)
- 2. (c) Carlos Sanchez, some rights reserved (CC BY-NC), uploaded by Carlos Sanchez
- 3. (c) Mike Pennington, some rights reserved (CC BY-SA)
- 4. (c) 116916927065934112165, some rights reserved (CC BY), uploaded by 116916927065934112165
- 5. (c) Len Blumin, some rights reserved (CC BY-NC-ND)
- 6. (c) Alan R. Biggs, some rights reserved (CC BY-NC-ND), uploaded by Alan R. Biggs
- 7. (c) Ján Svetlík, some rights reserved (CC BY-NC-ND)
- 8. (c) Roger Butterfield, some rights reserved (CC BY-NC-SA)
- 9. (c) Andrew, some rights reserved (CC BY-NC)
- 10. (c) Julien Renoult, some rights reserved (CC BY), uploaded by Julien Renoult
- 11. (c) Jack Wolf, some rights reserved (CC BY-NC-ND)
- 12. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 13. (c) Gregory "Slobirdr" Smith, some rights reserved (CC BY-SA)
- 14. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
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- 16. (c) Bobby McCabe, some rights reserved (CC BY), uploaded by Bobby McCabe
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- 18. (c) Victor W Fazio III, some rights reserved (CC BY-NC), uploaded by Victor W Fazio III
- 19. (c) Jim Johnson, some rights reserved (CC BY-NC-ND), uploaded by Jim Johnson
- 20. (c) fiddleman, some rights reserved (CC BY-NC), uploaded by fiddleman
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- 22. (c) Rick Leche, some rights reserved (CC BY-NC-ND)
- 23. (c) Robert Keereweer, some rights reserved (CC BY-NC)
- 24. (c) BJ Stacey, some rights reserved (CC BY-NC), uploaded by BJ Stacey
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- 27. (c) Warren Cronan, some rights reserved (CC BY-NC), uploaded by Warren Cronan
- 28. (c) Mike Leveille, some rights reserved (CC BY-NC), uploaded by Mike Leveille
- 29. (c) Steve Guttman NYC, some rights reserved (CC BY-NC-ND)
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- 33. (c) rbbrummitt, some rights reserved (CC BY-NC), uploaded by rbbrummitt
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- 35. (c) Kenneth Cole Schneider, some rights reserved (CC BY-NC-SA)
- 36. (c) Michael, some rights reserved (CC BY-NC-SA)
- 37. (c) Dawn Vornholt, some rights reserved (CC BY-NC-ND)
- 38. (c) Michael Hodge, some rights reserved (CC BY-NC-SA)
- 39. (c) Ian Marsman, some rights reserved (CC BY-NC-ND)
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- 42. (c) Pedro Peloso, some rights reserved (CC BY-NC), uploaded by Pedro Peloso
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- 48. (c) Jason M Crockwell, some rights reserved (CC BY-NC-ND), uploaded by Jason M Crockwell
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- 52. (c) Jonathan (JC) Carpenter, some rights reserved (CC BY-NC), uploaded by Jonathan (JC) Carpenter
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- 59. (c) cyric, some rights reserved (CC BY-NC-SA), uploaded by cyric
- 60. (c) Eric Isley, some rights reserved (CC BY-NC), uploaded by Eric Isley
- 61. (c) Steve Guttman, some rights reserved (CC BY-NC-ND)
- 62. (c) Shanthanu Bhardwaj, some rights reserved (CC BY-SA)
- 63. (c) Bastiaan, some rights reserved (CC BY-NC-ND)
- 64. (c) Melody Lytle, some rights reserved (CC BY-NC), uploaded by Melody Lytle
- 65. (c) Terry Ross, some rights reserved (CC BY-SA)
- 66. (c) Eric in SF, some rights reserved (CC BY-NC-ND)
- 67. (c) Matthew O'Donnell, some rights reserved (CC BY-NC-SA), uploaded by Matthew O'Donnell
- 68. (c) dogtooth77, some rights reserved (CC BY-NC-SA)
- 69. (c) Susan J. Hewitt, some rights reserved (CC BY-NC), uploaded by Susan J. Hewitt
- 70. (c) Meghan Cassidy, some rights reserved (CC BY-SA), uploaded by Meghan Cassidy
- 71. (c) Grahame, some rights reserved (CC BY-NC-ND), uploaded by Grahame
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- 78. (c) Bas Kers, some rights reserved (CC BY-NC-SA)
- 79. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
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- 81. (c) Kent McFarland, some rights reserved (CC BY-NC)
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- 83. (c) Lori Anne, some rights reserved (CC BY-NC), uploaded by Lori Anne
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- 85. (c) Tom Palmer, some rights reserved (CC BY-NC), uploaded by Tom Palmer
- 86. (c) 2010 Todd Pierson, some rights reserved (CC BY-NC)
- 87. (c) Sean McCann, some rights reserved (CC BY-NC-SA)
- 88. (c) Fyn Kynd, some rights reserved (CC BY-SA), uploaded by Fyn Kynd
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