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Start Over Formats Still image ✖Remove constraint Formats: Still image Collections Images from the History of Medicine (IHM) ✖Remove constraint Collections: Images from the History of Medicine (IHM) Subjects African Americans ✖Remove constraint Subjects: African Americans Authors Bredland, Ralph. ✖Remove constraint Authors: Bredland, Ralph. Titles Mrs. Pearl Caldwell operates the MacBeth densitometer ✖Remove constraint Titles: Mrs. Pearl Caldwell operates the MacBeth densitometer

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