Ogarrio, Fornando Espinoza -- Correspondence
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O’Connor, Basil, 1892-1972 -- Correspondence
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Pace, H. R. -- Correspondence
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Pan American Airways Corporation
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Pan American Sanitary Bureau
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Parker, Robert P. -- Correspondence
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Paul, John R. (John Rodman), 1893-1971 -- Correspondence
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Payne, Anthony M. M. -- Correspondence
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Payot, F. -- Correspondence
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Payout, M. -- Correspondence
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Personality and culture -- Russia
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Phlebotomus Fever
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Poliomyelitis
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Poliomyelitis Eradication
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Poliovirus
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Poliovirus Vaccine, Inactivated
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Poliovirus Vaccine, Inactivated -- adverse effects
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Poliovirus Vaccine, Oral
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Poliovirus Vaccine, Oral -- administration & dosage
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Poliovirus Vaccine, Oral -- adverse effects
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