| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Appalachian Kentucky,: An exploited region, | 978-0-07-092799-5 (0-07-092799-5) | 1971 |
| California: the imbalance between people and water, | 978-0-07-092798-8 (0-07-092798-7) | 1971 |
| The Great Plains;: The anatomy of a region, | 978-0-07-092797-1 (0-07-092797-9) | 1971 |