TY  - BOOK
AU  - Hynek,Joseph Allen
TI  - Challenge of the universe
T2  - Vistas of science, 4
AV  - QB44 .H9
U1  - 523.1 
PY  - 1962///]
CY  - New York
PB  - Scholastic Book Services
KW  - Astronomy
KW  - Local
N1  - Includes bibliography
ER  -