May 18, 1971
Note from Chairman of the Bulgarian Union for Physical Culture and Sport, Regarding 1971 Sofia Wrestling World Cup
Note from the Chairman of the Bulgarian Union for physical Culture and Sport, Tredafil Martinski, detailing plans to exclude capitalist countries from participation in the 1971 Wrestling World Cup to be held in Sofia, Bulgaria.
July 03, 1985
Letter to the Central Committee of the Bulgarian Communist Party, from the Secretary of the Korean Workers’ Party, Hwang Jang-yeop
A letter from Secretary of the Central Committee of the Korean Workers' Party, Hwang Jang-yeop, detailing North Korea objections to South Korea hosting the 1988 Olympics and calling for a unified "Korean Olympics."
September 18, 1985
Memo of Meeting Between Bulgarian Deputy Foreign Minister, Maria Zaharieva, and North Korean Ambassador to Bulgaria, Ha Dong-yun
Bulgarian Deputy Foreign Minister, Maria Zaharieva meets with North Korean Ambassador, Ha Dong-yun to discuss North Korea's concerns regarding South Korean involvement in international venues to be hosted in Bulgaria.