Stamps of Denmark, 21 Nov 1963

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postage

1963, Nov 21 Bohr theory 50th issue unwmk p. 12.75
Colnect-156-318-Bohr-Niels.jpgColnect-3939-732-Bohr-Niels.jpg
X 35o redbrn hydrogen atom & Niels Bohr
X 60o dkbl hydrogen atom & Niels Bohr

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