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Start Over Subjects Vaccines ✖Remove constraint Subjects: Vaccines Titles Letter from Colin M. MacLeod to United States Army, Office of the Surgeon General ✖Remove constraint Titles: Letter from Colin M. MacLeod to United States Army, Office of the Surgeon General Genre Letters (correspondence) ✖Remove constraint Genre: Letters (correspondence)

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  • Letter from Colin M. MacLeod to United States Army, Office of the Surgeon General1