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Economic development of the People's Republic of Bulgaria and socialist integration
Tsarevski, Nesho, (1977)
Ökonomische und politische Aspekte des Ost-West-Handels
Berg, Michael von, (1968)
Pakistan's trade with eastern bloc countries
Kidron, Michael, (1972)
Improving the Foreign Exchange Relations of Comecon Member Nations
Ivanov, Iu. A., (1974)