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1. Subject = Online-Community
2. Subject = Soziales Netzwerk
3. Subject = Geschichte 500-1500
4. Subject = Mensch-Maschine-Kommunikation
5. Subject = Geschichte 1100-1343
6. Subject = Frankreich
7. BV-Nummer = BV013481719
8. Subject = Deutschland (Östliche Länder)
9. BV-Nummer = BV013077096