TY  - BOOK
AU  - Morrison,David
TI  - Frontiers of astronomy
SN  - 0030303486
AV  - QB43.2 .M66 1990
PY  - 1990///
CY  - Philadelphia
PB  - Saunders College Pub.
KW  - Astronomy.
KW  - Astronomy--Study and teaching.
N1  - Dizin var
ER  -