1999 - Introductory Astronomy (Hardcover) → Paperback ISBN-13: 9780471983316 ISBN-10: 0471983314 Genres: Science & Math, Engineering & Transportation ? 1998 - Introductory Astronomy (Paperback) → Hardcover ISBN-13: 9780471983323 ISBN-10: 0471983322 Genres: Science & Math, Engineering & Transportation ? |