TY  - BOOK
AU  - MAYER ,BEN
AU  - LILLER ,BILL
TI  - THE CAMBRIDGE ASTRONOMY GUIDE: A PRACTICAL INTRODUCTION TO ASTRONOMY / 
U1  - 523 
PY  - 1985///
CY  - [S.N] : 
PB  - CAMBRIBGE UNIVERSITY PRESS ، 
KW  - ASTRONOMY
KW  - AMATEURS MANUALS
ER  -