TY  - BOOK
AU  - Roy,A.E.
AU  - Clarke,D.
TI  - Astronomy: principles and practice 
SN  - 0852743939 (pbk.) :
AV  - QB43.2 .R68 1988
U1  - 520 19
PY  - 1988///
CY  - Bristol
PB  - Adam Hilger Ltd., 
KW  - Astronomy
N1  - Includes bibliographical references (p. 344-345) and index
UR  - http://www.loc.gov/catdir/enhancements/fy0745/87032403-d.html
ER  -