  2001 - Introductory Astronomy Exercises (Paperback) → Paperback ISBN-13: 9780534379773 ISBN-10: 053437977X Genres: Science & Math, Engineering & Transportation ?  1990 - Introductory Astronomy Exercises (Paperback) → Paperback ISBN-13: 9780534125226 ISBN-10: 0534125220 Genres: Science & Math, Engineering & Transportation ? |
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