| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| A Groundwater Quality Monitoring: A Practical Guide for Drinking Water Source Protection | 978-0-419-25890-2 (0-419-25890-6) | 2006 | S.S.D. Foster · P. J. Chilton |
| Groundwater Quality Monitoring: A Practical Guide for Drinking Water Source Protection | 978-0-419-25880-3 (0-419-25880-9) | 2006 | S.S.D. Foster · P. J. Chilton |
Gabriele R. Helmer · Monika Rox-Helmer · R. H. · Ray G. Helmer · Richard Helmer · Richard P. Helmer · Robert Helmer · Robert Helmer MacArthur · Robert Helmer McArthur · Roberta Helmer Stalberg