Home1999 Treaties and Agreements ...Bulgaria (12979) – Agreement Concerning Economic, Technical and Related Assistance hide Bulgaria (12979) – Agreement Concerning Economic, Technical and Related Assistance TIAS Office of Treaty Affairs February 1, 1999 Foreign Assistance: Economic and Technical Cooperation Agreement signed at Sofia July 27, 1998; Entered into force February 1, 1999. Download attachment [604 KB] Tags Bulgaria Foreign Assistance Treaties