- (May be the largest in the world.)
Art reproduced from image depicting Mendeleev's Periodic System on on the wall of the Mendeleev Institute of Weights and Measures.
First Day Cover commemorating United Nations efforts for the cessation of nuclear testing and preservation of humanity
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…
Stamp issued to publicize the 20th Congress of the International Union of Pure and Applied Chemistry (IUPAC), held in Moscow, July 12-18. The names of both the organization and the host city are spelled with chemical…