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  Postage stamps

  First Day Cover commemorating Xu Guangxian

  • 2009-Nov-07

  Cachet, postmark, and stamp depicting rare earth chemist Xu Guangxian (1920-2015). Xu, also known as Kwang-hsien Hsu, was a Chinese chemist who held various positions in the Department of Chemistry at Peking University.…

  • Subject Xu, Guangxian, Rare earths, Chemists, Cachets (Philately), Commemorative postage stamps, Science on postage stamps, Postmarks, China