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Genre Postage stamps Remove constraint Genre: Postage stamps Date 1971 Remove constraint Date: 1971

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    • 1971

    Stamp depicts the maple leaf cement factory in Daud Khel, Pakistan. The Colombo Plan for Cooperative Economic and Social Development in Asia and the Pacific is a regional inter-governmental organization. It was…

    • 1971

    Cachet, semipostal stamp, and postmark feature a portrait of the chemist, François Auguste Victor Grignard. The cachet and stamp also depict the apparatus Grignard used to produce the Grignard reaction, a new method for…

    • after 1950 – before 1995

    Stamp depicts profile of Fritz Haber who received the Nobel Prize in Chemistry in 1918 for developing a process to synthesize ammonia from nitrogen and hydrogen gas, which allowed for the large-scale synthesis of…

    • 1971

    Cachet includes two depictions of Lord Rutherford and text, "World Famous Scientist Pioneering in Radioactivity and Nuclear Physics." The research program in the field of radioactivity undertaken by Rutherford at…