| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| The changing world of living things, | Hardcover | 978-0-03-080283-6 (0-03-080283-0) | 1972 |
| The changing world of living things, | Paperback | 978-0-03-080284-3 (0-03-080284-9) | 1972 |
| What we find when we look under rocks, | " | 978-0-07-004276-6 (0-07-004276-4) | 1971 |