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Creator Słania, Czesław Remove constraint Creator: Słania, Czesław Subject Atomic structure Remove constraint Subject: Atomic structure Subject Postmarks Remove constraint Subject: Postmarks 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.