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Start Over Collections Images from the History of Medicine (IHM) ✖Remove constraint Collections: Images from the History of Medicine (IHM) Subjects Air Pollution -- prevention & control ✖Remove constraint Subjects: Air Pollution -- prevention & control Titles [President Richard Nixon and Soviet President Nikolai Podgorny] ✖Remove constraint Titles: [President Richard Nixon and Soviet President Nikolai Podgorny]

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