000 00246pam a2200109a 44500
082 _a523.6
_bR418SE
100 _aRichter, Nikolaus B.
245 1 _aTHE NATURE OF COMETS
260 _a
_bMethuen & Co.
_c1963
964 _gCIRC
997 _a51843 C
999 _c412501
_d412501