Change Has Come to America, Palau, sheet of 4 stamps. The President Obama International Stamp Collection. No date given.
Barack Obama, 44th President of the United States. 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/180/
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