| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| A nature walk in Stanley Park: Lost Lagoon & Beaver Lake | 978-0-88836-016-8 (0-88836-016-9) | 1977 | |
| What's Wild Life Worth?: Economic Contributions of Wild Plants and Animals to Developing Countries | 978-0-905347-35-6 (0-905347-35-8) | 1982 | Robert Prescott-Allen |