1
by Leins, Werner, Thum, Wolfgang, Becker, Jürgen, Raue, Jürgen
Published 1973
VS Verlag für Sozialwissenschaften
Subjects: '; ...Engineering...

2
by Leins, Werner, Becker, Jürgen
Published 1976
VS Verlag für Sozialwissenschaften
Subjects: '; ...Engineering...