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  1. Get your tax records and transcripts | Internal Revenue Service

  2. IRS historical fact book : a chronology, 1646-1992

  3. Records of the Internal Revenue Service [IRS] - National Archives

  4. Tax returns in the United States - Wikipedia

  5. How the IRS Works: Functions and Audits - Investopedia

  6. IRS history timeline | Internal Revenue Service

  7. The Purpose and History of Income Taxes | St. Louis Fed