G20 World Leader Reception, Hosted by Queen Elizabeth II at Buckingham Palace, Sheet of 1 stamp. The President Obama International Stamp Collection. No date given.
G20 World Leader Reception. No date. Rodney Lawrence Hurst, Sr. Papers. University of North Florida. Thomas G. Carpenter Library. Special Collections and Archives. UNF Digital Commons. https://digitalcommons.unf.edu/hurst_stamps/151/
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