1989 - The Trachtenberg Speed System of Basic Mathematics (Paperback) → Paperback, Hardcover ISBN-13: 9780285629165 ISBN-10: 0285629166 ? 1982 - The Trachtenberg Speed System of Basic Mathematics (Hardcover) → Paperback, Hardcover ISBN-13: 9780313232008 ISBN-10: 0313232008 Genres: Science & Math, Engineering & Transportation ? Trachtenberg Speed Mathematics Selftaught (Paperback) ISBN-13: 9780385061766 ISBN-10: 0385061765 Genre: Science & Math ? |