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  • × author_ss:"Keen, E.M."
  1. Armstrong, C.J.; Keen, E.M.: Workbook for NEPHIS and KWAC : Microcomputer printed subject indexes teaching package, Pt.1 (1982) 9.91 
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  2. Armstrong, C.J.; Keen, E.M.: Manual for teaching NEPHIS and KWAC : Microcomputer printed subject indexes teaching package, Pt.2 (1982) 9.91 
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