  Textbook on Spherical Astronomy (Hardcover) → Paperback ISBN-13: 9780521215169 ISBN-10: 0521215161 Genres: Science & Math, Engineering & Transportation ?  Textbook on Spherical Astronomy (Paperback) → Hardcover ISBN-13: 9780521291804 ISBN-10: 0521291801 Genres: Science & Math, Engineering & Transportation ? |
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