Holdings
0.1978; 1979 - 1980,1-7.912; 1981; 1982,1-4u.7-12; 1983,1-9u.11; 1984,1u.3-5u.9-12; 1985,2u.4u.6u.9-10u.12; 1986,1-4u.7u.9u.11-12; 1987,2-4u.6-8u.10u.12; 1988,1u.4-5u.8/9; 1989,1-3u.5-6; 1990,2u.6; 1991,1-3u.5-6; 1992,1-3u.6; 15.1993,1u.3-6; 16.1994,1-2u.4; 17.1995,2-3u.5-6; 18.1996,1-4; 19.1997,2; 20.1998,1u.4-5; 21.1999,4; 22.2000,2u.4-6; 23.2001,1u.3-6