Cachet, semipostal stamp, and postmark depict Louis Pasteur. 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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Gauthier, Jacques. “First Day Cover Commemorating Louis Pasteur.” France, June 10, 1973. Fisher-Pasteur Memorial Collection, Box 1, Folder 24. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/6t053g07w.
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