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Start Over Formats Still image ✖Remove constraint Formats: Still image Subjects Fredrickson, Donald S. ✖Remove constraint Subjects: Fredrickson, Donald S. Languages English ✖Remove constraint Languages: English Genre Congresses ✖Remove constraint Genre: Congresses Dates by Range 1950-1999 ✖Remove constraint Dates by Range: 1950-1999 Publication Year 1956 ✖Remove constraint Publication Year: 1956

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