Obama 50 Birthday Celebration, January 18-20, 2011, Liberia, Sheet of one stamp. The President Obama International Stamp Collection.
Chinese President Hu Jin Tao Visits America. 2011. 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/183/
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