Bulgarian Cooperative Review

No.: 4/1981; 1, 2, 4/1982; 1, 2, 4/1983; 1-5/1984; 1, 2, 5, 6/1985; 1-6/1986; 2, 4, 6/1987; 1-6/1988; 1, 3, 5, 6/1989; 1, 5, 6/1990