Hits 641-644 within 644 documents
Hits 641-644 within 644 documents
Author(s): Wiedemann, Dieter; Stiehler, Hans-Jörg.- 1980. 22p.
Author(s): Geier, Wolfgang.- 1980. 8p.
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1980. 113p.
Author(s): Spitzky, Norbert; Kasek, Leonhard; Chrapa, Michael.- 1989. 87p.