A new CRS report by Andrew Austin and Mindy R. LevitIf discusses the history and increases of the debt limit and explain "the mechanisms available to raise the debt ceiling." "A companion report is Votes on Measures to Adjust the Statutory Debt Limit, 1978 to Present by Justin Murray (February 15, 2013, RL41814).
Hat tip Law Librarians Blog
Ernster, the Virtual Library Cat
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