1996 - Mystifying Math Puzzles (Paperback) → Paperback ISBN-13: 9780439082457 ISBN-10: 0439082455 Genre: Children's Books 3 1992 - Pencil Puzzlers (Paperback) ISBN-13: 9780806985428 ISBN-10: 0806985429 Genres: Children's Books, Humor & Entertainment 1 Test Your Math Iq (Paperback) → Paperback ISBN-13: 9780806907246 ISBN-10: 080690724X Genre: Science & Math ? |