000 00300nam a22001337a 4500
008 181207b xxu||||| |||| 00| 0 eng d
020 _a9781441957894
041 _aeng
080 _a521
100 _a52
101 _aAST
245 _aComets and How to Observe Them
_cSchmude,R
942 _2udc
_cBK
999 _c53044
_d53044