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Photo Credits
- 1. (c) Paul Meidinger, some rights reserved (CC BY-NC-SA)
- 2. (c) Harry Rose, some rights reserved (CC BY)
- 3. (c) wayne tucker, some rights reserved (CC BY-ND)
- 4. (c) Matt Lavin, some rights reserved (CC BY-SA)
- 5. (c) Jack Wolf, some rights reserved (CC BY-ND)
- 6. (c) J Brew, some rights reserved (CC BY-SA)
- 7. (c) Meekrok, some rights reserved (CC BY-NC)
- 8. (c) Jenn Forman Orth, some rights reserved (CC BY-NC-SA)
- 9. (c) Peter Prehn, some rights reserved (CC BY-NC-ND)
- 10. (c) Joshua Mayer, some rights reserved (CC BY-SA)
- 11. (c) Tom Hilton, some rights reserved (CC BY)
- 12. (c) randomtruth, some rights reserved (CC BY-NC-SA)
- 13. (c) 2008 Keir Morse, some rights reserved (CC BY-NC-SA)
- 14. (c) Montana State University Libraries, some rights reserved (CC BY-NC-SA)
- 15. (c) Salomé, some rights reserved (CC BY-NC-SA)
- 16. (c) Earl McGehee, some rights reserved (CC BY-NC-ND)
- 17. (c) CameliaTWU, some rights reserved (CC BY-NC-SA)
- 18. (c) 2009 Barry Breckling, some rights reserved (CC BY-NC-SA)
- 19. (c) 2005 Dean Wm. Taylor, some rights reserved (CC BY-NC-SA)
- 20. (c) docentjoyce, some rights reserved (CC BY)
- 21. (c) David Hofmann, some rights reserved (CC BY-NC-ND)
- 22. (c) James Gaither, some rights reserved (CC BY-NC-ND)
- 23. (c) Kristian Peters, some rights reserved (CC BY-NC-SA)
- 24. (c) Randi Hausken, some rights reserved (CC BY-NC)
- 25. (c) Dan and Raymond, some rights reserved (CC BY-NC-SA)
- 26. (c) Jean-Pol GRANDMONT, some rights reserved (CC BY-SA)
- 27. (c) 2011 Barry Breckling, some rights reserved (CC BY-NC-SA)
- 28. (c) AnneTanne, some rights reserved (CC BY-NC-SA)
- 29. (c) Eric in SF, some rights reserved (CC BY-NC-ND)
- 30. (c) 2003 Brent Miller, some rights reserved (CC BY-NC-SA)
- 31. (c) bramblejungle, some rights reserved (CC BY-NC)
- 32. (c) NATT-at-NKM, some rights reserved (CC BY)
- 33. (c) Franco Folini, some rights reserved (CC BY)
- 34. (c) Phil Sellens, some rights reserved (CC BY)
- 35. (c) Joshua, some rights reserved (CC BY-NC-SA)
- 36. (c) 2003 Dianne Fristrom, some rights reserved (CC BY-SA)
- 37. (c) Doris, some rights reserved (CC BY-NC-SA)
- 38. (c) Arthur Chapman, some rights reserved (CC BY-NC-SA)
- 39. (c) Antony Wilson, some rights reserved (CC BY), uploaded by Antony Wilson
- 40. (c) José María Escolano, some rights reserved (CC BY-NC-SA)
- 41. (c) Jon Sullivan, some rights reserved (CC BY-NC)
- 42. (c) Steve Chilton, some rights reserved (CC BY-NC-ND)
- 43. (c) Larry Miller, some rights reserved (CC BY-NC)
- 44. (c) birdgal5, some rights reserved (CC BY-NC-ND)
- 45. (c) Steven J. Baskauf, some rights reserved (CC BY)
- 46. (c) Tatiana Gerus, some rights reserved (CC BY-NC)
- 47. (c) John Tann, some rights reserved (CC BY)
- 48. (c) George F Mayfield, some rights reserved (CC BY-SA)
- 49. (c) Dietmut Teijgeman-Hansen, some rights reserved (CC BY-NC-ND)
- 50. (c) C. E. Timothy Paine, some rights reserved (CC BY-NC)
- 51. (c) Bill Bouton, some rights reserved (CC BY-NC-ND)
- 52. (c) AnneTanne, some rights reserved (CC BY-NC)
- 53. (c) stonebird, some rights reserved (CC BY-NC-SA)
- 54. (c) Steve Berardi, some rights reserved (CC BY-SA)
- 55. (c) Scott Wilson, some rights reserved (CC BY-ND)
- 56. (c) Andreas Philipp, some rights reserved (CC BY-NC-ND)
- 57. (c) Alan Harper, some rights reserved (CC BY-NC)
- 58. (c) Patrick Alexander, some rights reserved (CC BY-NC-ND)