Semipostal stamps commemorating the 150th anniversary of the birth of Louis Pasteur. Includes two postmarks depicting Pasteur, with Pasteur also featured on the first day of issue cancel. 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.
Gauthier, Jacques. “Facsimile of a Pasteur Letter, with French Postage Stamps Commemorating Louis Pasteur.” France, June 10, 1973. Fisher-Pasteur Memorial Collection, Box 1, Folder 24. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/db78tc04f.
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