U.S. Public Debt 1981-2012

http://en.wikipedia.org/wiki/United_States_public_debt#History

http://imgur.com/r/Economics/3MfpG

http://finance.yahoo.com/news/biggest-holders-of-us-gov-t-debt.html

http://www.treasurydirect.gov/NP/BPDLogin?application=np

http://www.usmessageboard.com/politics/177964-debt-ceiling-increases-by-president-1981-2011-a.html