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 = "AHEARN&VANYSEK1992"                                     
  REFERENCE_DESC   = "A'Hearn, M.F. and V. Vanysek, 1992. Photometry          
    and Polarimetry Network. The Comet Halley Archive - Release 1.0           
    CD-ROM USA_NASA_IHW_HAL_0019 through _0024 (Arch: E. Grayzeck,            
    D. Klinglesith, M. Niedner).  International Halley Watch,                 
    Goddard Space Flight Center, Greenbelt, MD."                              
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "AHEARN1991"                                             
  REFERENCE_DESC   = "                                                        
    A'Hearn, M.F., 1991. Photometry and Polarimetry Network, The Comet        
    Halley Archive Summary Volume, Ed. Z. Sekanina (Pasadena:                 
    JPL), 193-235."                                                           
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "AHEARNETAL1979"                                         
  REFERENCE_DESC   = "A'Hearn, M.F., R.L. Millis and P.V. Birch, 1979.        
    Gas and dust in some recent periodic comets. Astronomical Journal,        
    84, 570-579."                                                             
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "AHEARNETAL1981"                                         
  REFERENCE_DESC   = "A'Hearn, M.F., R.L. Millis and P.V. Birch 1981.         
    Comet Bradfield 1979 X - The gassiest comet?  Astronomical Journal,       
    86, 1559-1566."                                                           
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 = "AHEARNETAL1995"                                         
  REFERENCE_DESC   = "                                                        
    A'Hearn, M.F., R.L. Millis, D.G. Schleicher, D.J. Osip, and               
    P.V. Birch, 1995. The Ensemble of Properties of Comets: Results           
    from Narrowband Photometry of 85 Comets, 1976-1992. Icarus,               
    118, 223-270."                                                            
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "COCHRAN&SCHLEIC1993"                                    
  REFERENCE_DESC   = "Cochran, A.L. and D.G. Schleicher, 1993.                
    Observational constraints on the lifetime of cometary H2O.                
    Icarus, 105, No. 1, 235-253."                                             
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 = "KIMETAL1989"                                            
  REFERENCE_DESC   = "Kim, S.J., M.F. A'Hearn and W.D. Cochran, 1989.         
    NH emissions in comets - Flourescence vs collisions.  Icarus 77,          
    98-108."                                                                  
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "OSBORNETAL1990"                                         
  REFERENCE_DESC   = "                                                        
    Osborn, W.H., M.F. A'Hearn, U. Carsenty, R.L. Millis, D.G.                
    Schleicher, P.V. Birch, H. Moreno, and A. Gutierrez-Moreno,               
    Standard Stars for Photometry of Comets, Icarus, 88, 288,                 
    1990."                                                                    
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "OSIPETAL1992"                                           
  REFERENCE_DESC   = "Osip, D.J., D.G. Schleicher, R.L. Millis,               
    M.F. A'Hearn and P.V. Birch, 1992. 15 years of comet photometry:          
    A comparative analysis of 80 comets.  'Asteroids, Comets, Meteors         
    1991', Lunar and Planetary Institute, 443-445."                           
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "RANDALLETAL1992"                                        
  REFERENCE_DESC   = "Randall, C.E., D.G. Schleicher, R.G. Ballou,            
    and D.J. Osip, 1992.  Observational constraints on molecular              
    scalelengths and lifetiems in comets.  Bulletin of the Astronomical       
    Society, Vol. 24, No. 3, 1063 [abstract]."                                
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "SCHLEICHER&AHEA1988"                                    
  REFERENCE_DESC   = "                                                        
    Schleicher, D.G., and M.F. A'Hearn, The Fluorescence of                   
    Cometary OH. Astrophys. J., 331, 1058, 1988."                             
END_OBJECT = REFERENCE                                                        
                                                                              
OBJECT     = REFERENCE                                                        
  REFERENCE_KEY_ID = "SCHLEICHER1983"                                         
  REFERENCE_DESC   = "                                                        
    Schleicher, D.G., The Fluorescence of Cometary OH and CN, PhD             
    Thesis, University of Maryland, 1983."                                    
END_OBJECT = REFERENCE                                                        
                                                                              
END