R. H. · Rex Harley · Rich Harrill · Rosie Harlow / Gareth Morgan
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Energy and Power | 978-0-7534-5502-9 (0-7534-5502-1) | 2002 | Sally Morgan |
| Garbage and Recycling | 978-0-7534-5503-6 (0-7534-5503-X) | 2002 | |