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¬Der Alte Realkatalog der Staatsbibliothek ist online (2006)
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Neues Internet-Portal für Pädagogik (2005)
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Schmitz-Esser, W.: Publikumsfragen an Literatur zur Zeitgeschichte (1993)
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Burckhardt, D.: Historische Rezensionen online : Eine thematische Suchmaschine von Clio-online (2007)
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Getlnfo: Wissensportal für Naturwissenschaften und Technik (2007)
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