| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| Why Do We Still Have an Ecological Crisis? | Paperback | 978-0-13-958736-8 (0-13-958736-5) | 1972 |
| Why Do We Still Have an Ecological Crisis? | Hardcover | 978-0-13-958744-3 (0-13-958744-6) | 1972 |
R. A. · R. Armstrong · T.A. · T. Armstrong · T. R. · Terry Armstrong · Terry R.