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Tax code, regulations and official guidance - Internal Revenue …
Tax law | Definition, Types, & Examples | Britannica Money
Tax law - Wikipedia
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Taxation in the United States - Wikipedia
How the U.S. Tax Code Works and Its Sections - Investopedia
Tax Policy - U.S. Department of the Treasury
Income Tax | Wex | US Law | LII / Legal Information Institute
Federal Tax Law: A Beginner's Guide - Library of Congress
Tax Law and Policy - Harvard Law School | Harvard Law School