M P · R. P. · Richard M. · Richard Maxwell, Pearl · Richard P. · Richard Pearl
Cliffs Notes · HarperCollins · McGraw-Hill · Swallow Press
| title | ISBN-13 | year of publica- tion |
|---|---|---|
| Colorado Gem Trails: And Mineral Guide | 978-0-8040-0956-0 | 1972 |
| Geology | 978-0-8220-1718-9 | 1982 |
| Geology | 978-0-06-460160-3 | 1975 |
| Handbook for Prospectors | 978-0-07-049025-3 | 1973 |
| Rocks and Minerals | 978-0-06-463260-7 | 1969 |