Holdings
1.1961 - 12.1972; 17.1977, 6; 21.1981, 1, 3-6; 22.1982, 1,2, 4-6: 23.1983 - 26.1986; 27,1987, 2,3; 28.1988; 29.1989 - 34.1994; 35.1995, 1,2,4: 36.1996, 2,3,4; 37.1997 - 40.2000; 41.2001, 2-4; 42.2002, 1,2,4; 43.2003,1,3; 44,2004,1,3,4; 45.2005
[lückenhaft]