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John W. Johnson
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KERMIT L. HALL. "Helvering v. Davis." The Oxford Companion to the Supreme Court of the United States. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.
KERMIT L. HALL. "Helvering v. Davis." The Oxford Companion to the Supreme Court of the United States. 2005. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O184-HelveringvDavis.html
KERMIT L. HALL. "Helvering v. Davis." The Oxford Companion to the Supreme Court of the United States. 2005. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O184-HelveringvDavis.html
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