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LBR Routines, LBR$LOOKUP_KEY, Condition Values Returned
 *Conan The Librarian 

    LBR$_ILLCTL        Specified library control index not valid.
    LBR$_INVRFA        RFA obtained not valid.
    LBR$_KEYNOTFND     Specified key not found.
    LBR$_LIBNOTOPN     Specified library not open.
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