Holdings
- Suppl. zu 61.1969,1; 64.1970,2; 68.1971,1; 71.1972,3; 73.1973; 74.1973,1-2; 77.1974,1; 79.1975; 80.1975,3; 83.1976,3; 86.1977,2; 88.1978,4; 91.1979,4; 92.1979,1; 94.1980,4; 97.1981,1; 100.1982,1; 104.1983,1; 107.1984,3; 110.1985,3; 113.1986,1; 116.1987,1