Denmark – Scott # 785, used
$0.50A used 1985 Danish stamp honoring physicist Niels Bohr on the centennial of his birth.
Physics
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France – Scott # 2419-20
$1.001994 France Scott #2419–2420, complete MNH Europa pair commemorating the discovery of the AIDS virus and Louis de Broglie’s matter waves.
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France – Scott # B352, used
$0.501961 France Scott B352 semi-postal honoring physicist Charles-Augustin de Coulomb, 0.20f+0.10f. Used.