*NOTE: If "Medium" column says "Web", click on the respective links to go to the listed site:
Web 3
Web 4
Web 8
Web 9
Web 11
Web 3
Web 4
Web 8
Web 9
Web 11
Extra Sources (External Links for More Info.)
- Pony Express Video: http://www.youtube.com/watch?feature=player_detailpage&v=YXFZ4qPfpvg
- Clipper Ships More Information: http://www.uh.edu/engines/epi338.htm
- Erie Canal Video: http://www.history.com/shows/america-the-story-of-us/videos/building-the-erie-canal#building-the-erie-canal