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Hits 1-3 within 3 documents
Author(s): Richter, W.; Schumann, Lothar.- 1972. 45p.
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1977. 62p.
Author(s): Büttner, Christian; Gottberg, Joachim von.- 1995. 37p.