Holdings
3.1968,11-12; 4.1969,14-16; 5.1970,17-19; 6.1971,21,27; 7.1972,27; 8.1973,29-32; 8.1974,33-36; 9.1975,37-38; 10.1976,41-43; 11.1977,46,48; 12.1979,55; 13.1979,56; 14.1980,57; 15.1981,61-62; 17.1983,69; 21.1986,81; 21.1987,85; 33.1999,133 - Nr. 152.2003; 211.2018