Postcard image is of Albert Edelfelt's "Pasteur Dans Son Laboratoire" [Pasteur In His Laboratory]. Semipostal stamp depicts Louis Pasteur. Stamp includes 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. “Postcard and French Postage Stamp Commemorating Louis Pasteur.” France, n.d. Witco Stamp Collection, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/c821gk01g.
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