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Subject Atomic structure Remove constraint Subject: Atomic structure Subject Postmarks Remove constraint Subject: Postmarks Subject Cachets (Philately) Remove constraint Subject: Cachets (Philately) Subject Commemorative postage stamps Remove constraint Subject: Commemorative postage stamps

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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.