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Birth Bicentenary of Carl Friedrich Gauss (1777-1855), Gauss - Carl Friederich, mathematician serie, circa 1977 #142165628
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MOSCOW, RUSSIA - FEBRUARY 20, 2019: A stamp printed in Germany, Federal Republic, shows Birth Bicentenary of Carl Friedrich Gauss (1777-1855), Gauss - Carl Friederich, mathematician serie, circa 1977
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