EINSTEIN EXTENDS RELATIVITY THEORY: New Work Seeks to "Unite Laws of Field of Gravitation and Electro-Magnetism." HE CALLS IT HIS GREATEST "Book," Consisting or Only Five Pages, Took Berlin Scientist Ten Years to Prepare. Origin of Matter Theory Seen. His Relativity Theory. EINSTEIN EXTENDS RELATIVITY THEORY
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New York Times (1923-); New York, N.Y.. 12 Jan 1929: 1.
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