Jordan, Tom. The Sky workbook / Tom Jordan and Scott Peters. - Pacific Grove, Calif. ; London : Brooks/Cole, 2001. - 200p. ; 28 cm. Includes CD-ROM. ISBN: 0534390722 (pbk.) 9780534390723 (pbk.) Nat. Bib. No.: GBA1-V5693 Subjects--Topical Terms: Astronomy.Astronomía LC Class. No.: QB 18 / J82s 2002 Dewey Class. No.: 520