1. Alan Cressler, September 21, 2009 via flickr

2. Gavin White, October 3, 2010 via flickr

3. Christine A. Scheller, November 3, 2012 via flickr

4. Rhode Island Sea Grant, October 29, 2012 via flickr

5. Azhar Elmiza, August 29, 2005 via flickr

6. Virginia Department of Transportation September 19, 2003 via flickr

7. Eric M. Vitale December 12, 2011 via my camera

8. Paris Kelly, January 1, 2006 via flickr

9. Stormscape Photography, March 9, 2008 via flickr

10. Bill Kennedy, July 8, 2008 via flickr

11. Jun December 26, 2012 via flickr

12. Cam17, August 8, 2008 via flickr

13. Barry, June 8, 2012 via flickr

14. Ralph L. Williams September 8 ,2011 via flickr

15. bobandteng1, August 28, 2012 via Statcrunch

16. January 9, 2010 via slabbed

17. The US National Archive September 19, 2001 via flickr

18. Donna, December 11, 2010 via flickr

19. Brent Denley, August 11, 2007 via flickr

20. Thomas_fitnesscoach, December 5, 2008 via flickr