TY  - BOOK
AU  - Abell,George O.
TI  - Exploration of the universe
SN  - 0030759552
AV  - QB45 .A16 1969
U1  - 520 
PY  - 1969///]
CY  - New York
PB  - Holt, Rinehart and Winston
KW  - Astronomy
N1  - Bibliography: p. 663-664
ER  -