TY  - BOOK
AU  - Roy, A. E
AU  - Clarke , D
TI  - Astronomy: principles and practice
SN  - 0-7503-0917-2
PY  - 2011///
CY  - New Delhi
PB  - Nutech Photolithopraphers
KW  - Astronomy principles
KW  - Observation techniques
ER  -