  Observational Astronomy (Hardcover) → Paperback, Hardcover ISBN-13: 9780521381994 ISBN-10: 0521381991 Genres: Science & Math, Engineering & Transportation, Outdoors & Nature, Substores ?  Observational Astronomy (Paperback) → Hardcover ISBN-13: 9780521396936 ISBN-10: 052139693X Genre: Science & Math ?  Observational Astronomy (Hardcover) → Paperback, Hardcover ISBN-13: 9780521853705 ISBN-10: 0521853702 Genres: Science & Math, Engineering & Transportation ? |
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