Guyana, sheet of 2 stamps. The President Obama International Stamp Collection. No date given.
U.S. President Barack Obama and Chinese President Hu Jintao. 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/167/
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