List of documents in the subdirectories of the DOCUMENT directory:            
                                                                              
   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     Taylor et al (IEEE Trans. Geoscience and Remote Sensing,          
            1980). Original instrument description and initial                
            observations paper.                                               
                                                                              
   DATA     Dataset documentation provided by the OIMS principal              
            investigator with the data at the time it was submitted           
            to NSSDC.                                                         
                                                                              
   MISSION  Mission and Spacecraft information for both the Orbiter and       
            probes derived from the Mission and Host catalog files.           
            The hypertext version includes many GIF images of useful tables   
            tables and figures published in Fimmel et al, 1995                
            (NASA SP-518, Pioneering Venus: A Planet Unveiled).               
                                                                              
The DOCUMENT directory contains 6 subdirectories, each of which contains      
a single document. Some of the documents are fully reproduced and others      
have only selected pages or sections which are appropriate for this           
archive. For each document, there is an ASCII text version of the             
original text and there are scanned images of the original pages which        
can be viewed to see graphics from the original documents.  Scanned           
image files are stored in Graphic Interchange Format files (GIF) in the       
GIF89a format. This format can be loaded into numerous word processors        
and drawing packages. Each file contains a single page of the original        
document. The file naming convention is FIGxx.GIF where xx is the             
scanned figure number.                                                        
                                                                              
For the MISSION document, there is also an HTML document available which      
preserves the original format of the document as much as possible.            
                                                                              
The journal papers included here are protected by copyright. See the          
copyright notices and statements of publication accompanying the              
papers for further information.