Nine small postage stamps in various denominations issued in commemoration of the 100th anniversary of the birth of Louis Pasteur in 1922. The large semipostal stamp was issued in 1936 and includes a surtax for the relief of unemployed intellectuals. A semipostal stamp is a postage stamp issued to raise money for a particular purpose (such as a charitable cause) and sold at a premium over the postal value.
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Hourriez, Georges. “Mounted French Postage and Semipostal Stamps Depicting Louis Pasteur.” France, 1922–1936. Fisher-Pasteur Memorial Collection, Box 1, Folder 19. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/9019s259q.
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