R. H. · R. Helmer · Richard H. · Richard P. Helmer
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| A Groundwater Quality Monitoring: A Practical Guide for Drinking Water Source Protection | 978-0-419-25890-2 | 2006 | S.S.D. Foster · P. J. Chilton |
| Groundwater Quality Monitoring: A Practical Guide for Drinking Water Source Protection | 978-0-419-25880-3 | 2006 | S.S.D. Foster · P. J. Chilton |
| Surveillance of Drinking Water Quality in Rural Areas | 978-0-470-21709-2 | 1991 | Barry Lloyd |
| Water Pollution Control: A Guide to the Use of Water Quality Management Principles | 978-0-419-22910-0 | 1997 | |