William D. · William Derricourt · William Drucker
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Geology Explained in the Forest of Dean and Wye Valley | 978-0-9534437-1-0 (0-9534437-1-X) | 2005 |
| Geology Explained in the Severn Vale and Cotswolds | 978-0-9534437-5-8 (0-9534437-5-2) | 2005 |