TY  - BOOK
AU  -  Ferguson, Kitty
ED  -  Nautical Almanac Office.
TI  - Prisons of light-- : black holes
SN  -  	0521625718 
U1  - 523.8875 
PY  - 2000///
CY  -  Cambridge
PB  -  Cambridge University Press.
KW  -     Black holes;stronomy; Gravity.     ;Light.
ER  -