TY  - BOOK
AU  - Protheroe,W.M.
AU  - Capriotti,E.R.
AU  - Newsom,G.H.
TI  - Exploring the universe
SN  - 067520898X
U1  - 520 23
PY  - 1989///
CY  - Columbus, Ohio
PB  - Merrill Pub. Co.
KW  - Astronomy
KW  - Thiên văn học
ER  -