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Language English Remove constraint Language: English Subject Commemorative postage stamps Remove constraint Subject: Commemorative postage stamps

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    • 1948-Jan-05

    Philatelic First Day Cover honoring American agricultural scientist and inventor George Washington Carver (1864?-1943). The envelope features an illustrated rendering of Carver and the Tuskegee Institute, as well as a…

    • 1948-Jan-05

    Philatelic First Day Cover honoring American agricultural scientist and inventor George Washington Carver (1864?-1943). The envelope features an illustrated rendering of Carver and the George Washington Carver Museum in…

    • 1963-Nov-21

    Stamps depict Niels Bohr, the equation for the Bohr frequency condition (an equation relating to light frequency and electrons), and a diagram of the Bohr model of a hydrogen atom.

    • 1975

    Stamp issued during International Women's Year (1975), depicting Marie Curie, "discoverer of radium," by the former British colony Saint Christopher-Nevis-Anguilla (now called the Federation of Saint Kitts and Nevis.)

    • 1922 – 1936

    Nine small postage stamps in various denominations issued in commemoration of the 100th anniversary of the birth of Louis Pasteur in 1922. The large semipostal stamp was issued in 1936 and includes a surtax for the…

    • 1976

    Depicts William Wrigley Jr., as well as a worker tapping a sapodilla tree, which was used to manufacture bubble gum. Includes the bicentennial logo of the American Revolution.

    • 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…

    • 1969

    Cachet depicts a light beam passing through a prism to create a spectrum. Stamp depicts colors of the spectrum. The 15th Colloquium Spectroscopicum Internationale was held May 26-30, 1969 in Madrid, Spain.

    • 1964

    Cachet and stamp depict a mushroom cloud from a nuclear weapons test. Cachet was created by Fleetwood and the stamp was commissioned by the United Nations Postal Administration. Postmark depicts the United Nations…