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  • × author_ss:"Wätjen, H.-J."
  • × theme_ss:"OPAC"
  1. Wätjen, H.-J.: ORBIS, der Oldenburger Online-Benutzerkatalog (1991) 0.01 
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  2. Wätjen, H.-J.: Hypertextbasierte OPACs im World-wide Web (1996) 0.01 
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