Hits 1-5 within 5 documents
Hits 1-5 within 5 documents
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1973. 9p.
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1979. 172p.
Author(s): Ettrich, Klaus Udo; Schreiber, Dieter.- 1973. 86p.
Author(s): Ulbrich, Klaus.- 1982. 32p.