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Photo Credits
- 1. (c) Shuk Han (Nancy) Mak, some rights reserved (CC BY-NC), uploaded by Shuk Han (Nancy) Mak
- 2. (c) Susan Elliott, some rights reserved (CC BY-NC), uploaded by Susan Elliott
- 3. (c) lvconrad1977, some rights reserved (CC BY-NC), uploaded by lvconrad1977
- 4. (c) Timothy Valentine, some rights reserved (CC BY-NC-SA)
- 5. (c) Hermann Falkner, some rights reserved (CC BY-NC)
- 6. (c) Mallory S., some rights reserved (CC BY-NC), uploaded by Mallory S.
- 7. (c) Josh*m, some rights reserved (CC BY-NC-SA)
- 8. (c) Howard Horne, some rights reserved (CC BY-NC), uploaded by Howard Horne
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- 10. (c) dogtooth77, some rights reserved (CC BY-NC-SA)
- 11. (c) Matt Lavin, some rights reserved (CC BY-SA)
- 12. (c) Bastiaan, some rights reserved (CC BY-NC-ND)
- 13. (c) Cephas, some rights reserved (CC BY-SA)
- 14. (c) Charlie Hohn, some rights reserved (CC BY), uploaded by Charlie Hohn
- 15. (c) Stefan Jansson, some rights reserved (CC BY-NC-SA)
- 16. (c) Sirpale79, some rights reserved (CC BY-NC-SA)
- 17. (c) Sergey Yeliseev, some rights reserved (CC BY-NC-ND)
- 18. (c) Tom Scott, some rights reserved (CC BY-NC), uploaded by Tom Scott
- 19. (c) Jason Hollinger, some rights reserved (CC BY)
- 20. (c) Susan J. Hewitt, some rights reserved (CC BY-NC), uploaded by Susan J. Hewitt
- 21. (c) Garth Holman, some rights reserved (CC BY-NC), uploaded by Garth Holman
- 22. (c) Samuel Brinker, some rights reserved (CC BY-NC), uploaded by Samuel Brinker
- 23. (c) Ivar Leidus, some rights reserved (CC BY-SA)
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- 25. (c) Jenn Forman Orth, some rights reserved (CC BY-NC-SA)
- 26. (c) Drew Avery, some rights reserved (CC BY), uploaded by Drew Avery
- 27. (c) Claudia Daggett, some rights reserved (CC BY-NC)
- 28. (c) Lewnanny Richardson, some rights reserved (CC BY-NC), uploaded by Lewnanny Richardson
- 29. (c) J. Burke Korol, some rights reserved (CC BY-NC), uploaded by J. Burke Korol
- 30. (c) botany08, some rights reserved (CC BY), uploaded by botany08
- 31. (c) James Gaither, some rights reserved (CC BY-NC-ND)
- 32. (c) Joe Walewski, some rights reserved (CC BY-NC), uploaded by Joe Walewski
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- 34. (c) John Tann, some rights reserved (CC BY)
- 35. (c) Liana May, some rights reserved (CC BY-NC), uploaded by Liana May
- 36. (c) Eric Hunt, some rights reserved (CC BY-NC-ND)
- 37. (c) Les, some rights reserved (CC BY-NC-ND)
- 38. (c) Sabrina Setaro, some rights reserved (CC BY)
- 39. (c) Anita363, some rights reserved (CC BY-NC)