Stock Photo - May 05, 1968 - May-Day Demonstration in Sofia: The foreign students,studying in Sofia,demonstrating (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)

Stock Photo: May 05, 1968 - May-Day Demonstration in Sofia: The foreign students, studying in Sofia, demonstrating (Credit Image: © Keystone Press Agency/Keystone USA via.

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