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Genre Postage stamps Remove constraint Genre: Postage stamps Language Danish Remove constraint Language: Danish Format Image Remove constraint Format: Image Rights In Copyright Remove constraint Rights: In Copyright Subject Postmarks Remove constraint Subject: Postmarks

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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.