PDS_VERSION_ID = PDS3                                                         
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "AHEARN&MILLIS1980"                                      
  REFERENCE_DESC   = "A'Hearn, M.F. and R.L. Millis, 1980.  Abundance         
    correlations among comets. Astronomical Journal, 85, 1528-1537."          
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "AHEARNETAL1983"                                         
  REFERENCE_DESC   = "A'Hearn, M.F., J.T. Ohlmacher, and D.G. Schleicher,     
    Univ. of Maryland Astronomy Program Technical Report TR AP83-044, 1983."  
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "AHEARNETAL1984"                                         
  REFERENCE_DESC   = "A'Hearn, M.F., D.G. Schleicher, R.L. Millis,            
    P.D. Feldman and D.T. Thompson, 1984. Comet Bowell 1980b.  Astronomical   
    Journal, 89, 579-591."                                                    
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "ARVESENETAL1969"                                        
  REFERENCE_DESC   = "Arvesen, J.C.,  R.J. Griffin, Jr., and B.D. Pearson,    
    Jr., Determination of Extraterrestrial Solar Spectral Irradiance from a   
    Research Aircraft, Appl. Opt., 8, 2215, 1969."                            
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "COCHRAN1986"                                            
  REFERENCE_DESC   = "Cochran, A.L., A Reevaluation of the Haser Model Scale  
    Lengths in Comets, Astron. J., 90, 2609, 1986."                           
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "COCHRAN1987"                                            
  REFERENCE_DESC   = "Cochran, A.L., Another Look at Abundance Correlations   
    Among Comets., Astron. J., 93, 231, 1987."                                
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "COCHRANETAL1992"                                        
  REFERENCE_DESC   = "Cochran, A. L., Barker, E. S., Ramseyer, T. F.,         
    and Storrs, A. D., The McDonald Observatory Faint Comet Survey: Gas       
    Production in 17 Comets, Icarus 98, No. 2, 151-162, 1992."                
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "HASER1957"                                              
  REFERENCE_DESC   = "                                                        
    Haser, L., Distribution d'Intensite dans la tete d'une comete,            
    Bull. Acad. R. Belgique, Classes des Sciences, Ser. 5, 43,                
    740, 1957."                                                               
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "STONE1977"                                              
  REFERENCE_DESC   = "                                                        
    Stone, E.C., The Voyager Missions to the Outer Solar System, Space Sci.   
    Rev., Vol. 21, p. 75, 1977."                                              
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "STORRSETAL1992"                                         
  REFERENCE_DESC   = "Storrs, A.D., A.L. Cochran, and E.S. Barker,            
    Spectrophotometry of the Continuum in 18 Comets, Icarus 98, No 2,         
    163, 1992."                                                               
END_OBJECT = REFERENCE                                                        
                                                                              
END