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American scientists design type

  • Colnect-2563-893-Scientists-Melvin-Calvin.jpg
  • US070.11.jpg
  • US071.11.jpg
  • US072.11.jpg
Short desc: American scientists




Used by 4 stamps: (See all uses as list)

United States 6/16/2011 forever d=Melvin Calvin (2011) perf=11
United States 6/16/2011 forever d=Asa Gray perf=11
United States 6/16/2011 forever d=Maria Goeppert Mayer perf=11
United States 6/16/2011 forever d=Severo Ochoa (2011) perf=11




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