The Great Depression

http://www.redmoonrising.com/AmericanBabylon/Part2.htm

http://members.tripod.com/~american_almanac/liebig.htm

http://members.tripod.com/~american_almanac/except2.htm

http://georgewashington2.blogspot.com/2009/01/more-people-will-be-unemployed-than.html

http://georgewashington2.blogspot.com/2010/04/unemployment-for-those-who-earn-150000.html

http://www.getsmartaboutbanks.com/2010/10/fraud-caused-the-crash-of-1929-and-the-great-depression-it-caused-the-economic-crisis-we-are-in-today/

http://www.huffingtonpost.com/ian-fletcher/protectionism-didnt-cause_b_527274.html

http://economyincrisis.org/content/protectionism-didn%E2%80%99t-cause-great-depression