1
2
Published: 1966
Superior document: Jenaer Reden und Schriften 1966
3
4
Published: 1970
5
Published: 1981
6
Published: 1970
7
Published: 1970
Superior document: Jenaer Reden und Schriften 1970
8
Published: 1968
Superior document: Jenaer Reden und Schriften 1968