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by Karl Bischoff
by Arnzen, Rudiger; Ullmann, Manfred
by Institut fur Bildungsforschung und Bildungsrecht; Institut fur Internationale Padagogische Forschung
by Hundershagen, Karl Bernhard
by Wibel, Hans
by Andreesen, Hermann
by Detto, A. W.
by Wieseler, Karl
by Klöden, Karl Friedrich von
by Ebisch, Walther