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Gerardo Varela and A. Aparīcio
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The Diarrhea of Travelers

II. Bacteriologic Studies of U. S. Students in Mexico

Gerardo Varela, B. H. Kean, Elizabeth L. Barrett, and Caroline J. Keegan
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Gustave Freeman, Gerardo Varela, Harry Plotz, and Carlos Ortiz Mariotte
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Juan J. Angulo, John H. L. Watson, C. Courtney Wedderburn, Francisco León-Blanco, and Gerardo Varela
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