Tables of Envelope Parameters of Comets Read Me First
Table of Hystorical Evolution of Density of Comets
Envelope Parameters of  Comets 1P, 19P, 21P, 81P
Envelope Parameters of Comets  19P, 26P, 28P, 67P
Envelope Parameters of Comets  9P, 19P, 67P
Envelope Parameters of Comets 26P, 28P, 67P
Rotational Periods and Amplitudes of JF comets.txt,  Updated
Table of BVRI color indexes of comets.txt  Updated
Rotational Periods and Amplitudes of JF comets.doc   UPDATED
Table of BVRI color Indexes of comets.doc           UPDATED