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Directory Results for Revenue Procedure 2001-11 - Penalties; substantial understatement.. Guidance is provided concerning when ination shown on a return will be adequate disclosure for purposes of reducing an understatement of income tax under section to Revenue Procedure 2001-14 - Maximum face amount of qualified zone academy bonds issued by each State. This procedure sets forth the maximum face amount of qualified zone academy bonds that may be issued by each State, the District of Columbia, and th