  1991 - Geometry for Enjoyment and Challenge (Hardcover) → Hardcover ISBN-13: 9780866099653 ISBN-10: 0866099654 Genres: Science & Math, Engineering & Transportation ?  1984 - Geometry for Enjoyment and Challenge (Hardcover) → Hardcover ISBN-13: 9780883439166 ISBN-10: 0883439166 Genres: Science & Math, Engineering & Transportation ? |
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