1. This image is attributed to David Shankbone © 2008 (CC BY-SA 3.0)

2. This image is attributed to the United States Public Domain without a Copyright.

3. This image is attributed to Ildar Sagdejev 2008 (GNU Free Documentation Licens

4. This image is attributed to David Wade © 2009 (CC BY-SA 3.0)

5. This image is attributed to Robert Lawton © 2006 (CC BY-SA 2.5)

6. This image is attributed to Mark Smith © 2009 (CC BY-SA 3.0)

7. This image is attributed to Óðinn © 2007 (GNU Free Documentation License)

8. This image is attributed to Bdlesile 2009 (CC BY_SA 2.0)

9. This image is attributed to Louis Roving 2009 (CC-A

10. This image is attributed to DR04 2008 (CC-A 3.0)

12. This image is attributed to Minesweeper 2009 (GNU Free Documentation License)

13. This image is attributed to Hector Alejandro 2011 (CC-A 2.0)

14. This image is attributed to Nayotake Murayama 2010 (CC BY_SA 2.0)

15. This image is attributed to RJN 2010 (CC-A 2.0)

16. This image is attributed to Ryanjo 2006 (US Public Domain)

17. This image is attributed to TonyTheTiger 2008 (CC BY-SA 3.0)

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19. This image is attributed to W.L. Tarbert and is in the public domain.

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