Internal Revenue Service Data Book, 2011: October 1, 2010 to September 30, 2011 By:"States United, Int","Internal Revenue Service (U S )" Published on 2012-05 by International Monetary Fund Covers October 1, 2004 to September 30, 2005. Provides data on collecting Federal tax revenue, enforcing tax law, assisting taxpayers, managing the internal revenue system. Includes lists of key IRS officials, and an organizational chart of the IRS. This Book was ranked 11 by Google Books for keyword stats.