http://memory.loc.gov/learn/lessons/00/canal/overview.html
Type of teaching unit: Unit Plan Time frame: 3 to 4 weeks Subject Matter: Marco Polo's Travel on the Erie Canal
http://memory.loc.gov/learn/lessons/01/west/overview.html
Type of teaching unit: Unit Plan Time frame: 4 weeks Subject Matter: Journeys West
http://memory.loc.gov/learn/lessons/99/road/intro.html
Type of teaching unit: Unit Plan Time frame: 5 days Subject Matter: Artifact Road Show
http://www.siue.edu/EDUCATION/AAM/lesson/clswtk/AAM%20Webpage/dairy.htm
Type of teaching unit: Unit Plan Time frame: 5 days Subject Matter: 1904 World's Fair