TY  - BOOK
AU  - Roy,A.E.
AU  - Clarke,D.
TI  - Astronomy: principles and practice 
SN  - 9781420057034 (ebook : PDF)
PY  - 2003///
CY  - Bristol, Philadelphia
PB  - Institute of Physics Pub.
KW  - Astronomy
N1  - Includes bibliographical references (p. 458-459) and index
UR  - http://marc.crcnetbase.com/isbn/9781420057034
ER  -