May 22, 1941
Pazardzhik
May 27, 1977
Burgas
May 01, 1987
Parvomay Municipality
May 29, 1981
Varna
May 25, 1988
Varna
May 24, 1972
Plovdiv
May 29, 1983
Pleven
May 29, 1977
Aleksin
May 27, 1924
Veliko Tarnovo
May 14, 1982
Smolyan
May 25, 1982
Plovdiv
May 28, 1849
Ruse
May 02, 1982
Bulgaria
May 09, 1994
Sofia
May 14, 1996
Plovdiv
May 15, 1971
Dobrich
May 26, 1940
Burgas