History of Income Taxes
Document - Timeline of
Taxes - 1861 - Present
US Department of the Treasury
http://www.treas.gov/
History of the US Tax System
http://www.treas.gov/education/fact-sheets/taxes/ustax.shtml
FAQ About Taxes
http://www.treas.gov/education/faq/taxes/
Fact Sheets
http://www.treas.gov/education/fact-sheets/taxes/
History of the IRS
http://www.irs.gov/irs/index.html
Office of Management and Budget
http://www.whitehouse.gov/omb/