Two Romanian postage stamps commemorating the Second Congress of the Association of Scientists and Technicians (ASIT), held in Bucharest, Romania, in 1957. The Stamp features an illustration of a slide rule and a caliper.
“Romanian Postage Stamps Commemorating the Second Congress of the Association of Scientists and Technicians,” May 1957. Witco Stamp Collection, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/qcg37s9.
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