Holdings
1.1947/48,1-2,4; 2.1949 - 14.1961; 15.1962,1-2,3; 16.1963 - 18.1965; 19.1966,1,3-4; 20.1967 - 21.1968; 22.1969,1-4,6; 23.1970 - 24.1971; 25.1972,1-2,4-6; 26.1973,1-5; 27.1974 - 28.1975; 29.1976,1-3,5-12; 30.1977 - 40.1987; 41.1988,1-6,8-12; 42.1989 - 51.1998; 52.1999,1,3-7,9-11