ABC mladych techniku a prirodovedcu

[ABC Junge Techniker und Natur]: 4/1979, 18/1981, 21/1984, 2/1985, 13/1986, 16/1986, 20/1986, 22/1986, 2/1987, 19/1987, 4/1988, 16/1988, 24/1988, 10/1990