TY  - BOOK
AU  - Abell,George Ogden
AU  - Morrison,David
AU  - Wolff,Sidney C.
TI  - Exploration of the universe
SN  - 0030051436
U1  - 520 19
PY  - 1987///
CY  - Philadelphia
PB  - Saunders College Publ.
KW  - Աստղագիտություն
N1  - Includes index; Bibliogr.: p. 692-698
ER  -