President Obama with HM Queen Elizabeth II at Buckingham Palace, Tuvalu, sheet of one stamp. The President Obama International Stamp Collection. No date given.
U.S. President Barack Obama, London, England. 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/190/
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