Document list:
   BRACE    Appendix A from Brace et al (Space Science Reviews, 1991) which
             describes some of the characteristics of the PVO ion detectors
             and their inter-calibration.

   GREBOWSK Appendix from Grebowsky et al (JGR, 1993) which discusses the
              OIMS instrument response to superthermal ions.

   MILLER   Miller et al (Icarus, 1984) - This paper also discusses some
             of the characteristics of the PVO ions detectors and their
             intercalibration.

   INST     Knudsen et al (IEEE Trans. Geoscience and Remote Sensing, 1980)
             Original instrument description and initial observations paper.

   MISSION  Mission and Spacecraft information for both the Orbiter and
            probes derived from the Mission and Insthost catalog files.
            The hypertext version includes many GIF images of useful tables
            and figures published in Fimmel et al, 1995 (Nasa SP-518,
            Pioneering Venus: A Planet Unvailed).

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