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Costa Rican President Oscar Arias of Costa Rica delivers commencement address at Harvard University

1987 Nobel Peace Prize-winning President Oscar Arias of Costa Rica waves after delivering the commencement address at the 337th Commencement Exercises at Harvard University in Cambridge, MA, on June 9, 1988. Arias, who received an honorary doctor of law degree, challenged the 5,500 undergraduate and graduate degree recipients to fight for peace in the 21st century. (UPI Photo/Don West/Files)

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