TY  - BOOK
AU  - Abell,George O.
TI  - Exploration of the universe
SN  - 0030759501
U1  - 523.1 
PY  - 1969///
CY  - New York
PB  - Holt, Rinehart and Winston
KW  - Astronomy
N1  - Bibliography: p. 431-432
ER  -