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Leonhard Euler, 1707, 1783, a Swiss mathematician and physicist. Portrait on a German post stamp
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Leonhard Euler, 1707, 1783, a Swiss mathematician ...

Leonhard Euler
BRK22C26_191

Leonhard Euler

Leonhard Euler
BRK22C15_348

Leonhard Euler

Portrait of Leonhard Euler
BRK19F74_424

Portrait of Leonhard Euler