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Hits 11-14 within 14 documents
Author(s): Richter, W.; Schumann, Lothar.- 1972. 45p.
Author(s): Schumann, Lothar; Wiedemann, Dieter.- 1970. 52p.
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1970. 44p.
Author(s): Hahn, Jochen.- 1985. 20p.