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Hits 1-3 within 3 documents
Author(s): Mattern, Ruperta.- 2001. 78p.
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1983. 39p.
Author(s): Cramm, Cathleen; Blossfeld, Hans-Peter; Drobnic, Sonja.- 1998. 26p.