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- 1. (c) Randall Wade (Rand) Grant, some rights reserved (CC BY-SA)
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- 3. (c) Sergey Yeliseev, some rights reserved (CC BY-NC-ND)
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- 7. (c) NOAA Great Lakes Environmental Research Laboratory, some rights reserved (CC BY-NC)
- 8. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
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- 21. (c) James Gaither, some rights reserved (CC BY-NC-ND)
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- 29. (c) 2006 Luigi Rignanese, some rights reserved (CC BY-NC)
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- 31. (c) Susan J. Hewitt, some rights reserved (CC BY-NC), uploaded by Susan J. Hewitt
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- 33. (c) Vicky Herrala, some rights reserved (CC BY-NC-SA)
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