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Start Over You searched for: Collections NLM Publications and Productions Remove constraint Collections: NLM Publications and Productions Subjects Abstracting and Indexing as Topic Remove constraint Subjects: Abstracting and Indexing as Topic Authors National Library of Medicine (U.S.) Remove constraint Authors: National Library of Medicine (U.S.) Copyright Public domain Remove constraint Copyright: Public domain Dates by Range 1950-1999 Remove constraint Dates by Range: 1950-1999 Publication Year 1961 Remove constraint Publication Year: 1961

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