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RIA Checkpoint - Tax Research 
"A comprehensive research system for federal tax matters. Full-text. Includes Federal Tax Coordinator U.S. Tax Reporter: Income, Estate, Gift & Excise Tax Analysis Internal Revenue Code (1954 - current) IRS Revenue Rulings & Procedures (1954 - current) Treasury Regulations Tax Court case law (1860 - current) Letter Rulings Citator (1954 - current) "
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Last Update: January 23, 2017