| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Amazing circle mazes | 978-0-06-090516-3 (0-06-090516-6) | 1976 |
| China: Why Was an Army Made of Clay? | 978-0-07-047999-9 (0-07-047999-2) | 1989 |
| Mexican Adventure | 978-0-02-182202-7 (0-02-182202-6) | 1997 |
HarperCollins · Macmillan · McGraw-Hill