  1989 - Math Teasers Mental Gymnastics (Hardcover) ISBN-13: 9780806969527 ISBN-10: 0806969520 Genres: Children's Books, Humor & Entertainment, Engineering & Transportation ?  1984 - New Genesis (Paperback) ISBN-13: 9780385193320 ISBN-10: 0385193327 Genres: Religion & Spirituality, Christian Books & Bibles ? |
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