P. H. · P R · Philip R. · R. H.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The earth and how it works: A lab manual and workbook with teaching ideas, projects, and activities in environmental science | 978-0-13-223447-4 (0-13-223447-5) | 1985 |
| The Earth and How It Works: Projects, Ideas, and Activities in Environmental Science | 978-0-13-223454-2 (0-13-223454-8) | 1989 |