TY  - BOOK
AU  - John,Duncan
TI  - astronomy: the definitive guide to the universe
SN  - 9781405491334
U1  - 520 21
PY  - 0000///د.ت
CY  - [s.l]
PB  - [s.n]
KW  - astronomy
KW  - sears
N1  - index 252 - 255
ER  -