Holdings
23.1978,1-3; 25.1980,1-8; 26.1981,2-8; 27.1982,1-8; 28.1983,1-8; 29.1984,1-8; 39.1985,1-5; 39.1985,8; 40.1986,10-12; 41.1987,1-12; 42.1988,1-7; 42.1988,9-12; 43.1989,1; 43.1989,3-4; 43.1989.6-12; 44.1990,1-12; 45.1991,1-12; 46.1992,1-12; 47.1993,1-12