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Hits 1-4 within 4 documents
Author(s): Witte, Erich H..- 2001. 24p.
Author(s): Cohen, Aaron.- 2007. 22p.
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1983. 48p.
Author(s): Thiele, Gisela.- 1989. 34p.