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Department Archives Remove constraint Department: Archives Genre Postage stamps Remove constraint Genre: Postage stamps Creator Słania, Czesław Remove constraint Creator: Słania, Czesław Format Image Remove constraint Format: Image Subject Postmarks Remove constraint Subject: Postmarks Subject Denmark Remove constraint Subject: Denmark

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    • 1963-Nov-21

    Stamps depict Niels Bohr, the equation for the Bohr frequency condition (an equation relating to light frequency and electrons), and a diagram of the Bohr model of a hydrogen atom.