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

    LBR$_ILLCTL        Specified library control index not valid.

    LBR$_ILLIDXNUM     Specified index number not valid.

    LBR$_LIBNOTOPN     Specified library not open.

    LBR$_NULIDX        Specified library empty.
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