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1Published 1935“... of the recent epidemic, Drs. Horace Pet- tit and D. Sergeant Pepper, University of Pennsylvania bacteriologists...”
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2Published 1935“.... Lindbergh. The physicians, Dr. Horace Pettit and Dr. Sergeant Pepper, of the University of Pennsylvania...”
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3Northwest History. State History. Aeronautics, Continued Airports, Commercial Service. 1936 to 1937.Published 1937“... to an argument advanced in the house of representatives by Congressman Robert Rich of Pennsylvania concerning...”
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