Hits 1-4 within 4 documents
Hits 1-4 within 4 documents
Author(s): Gerth, Werner.- 1970. 43p.
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1975. 10p.
Author(s): Kaftan, Burkhard.- 1977. 28p.
Author(s): Gerth, Werner; Burkhardt, Erwin; Bernard, Günter; Bertram, Barbara; Bonus, Hans; Heinrichs, W.; Höpfner, E..- 1970. 62p.