R.J. ยท R Johnston
| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| California Forests and Woodlands: A Natural History | Paperback | 978-0-520-20248-1 | 1996 |
| California Forests and Woodlands: A Natural History | Hardcover | 978-0-520-08324-0 | 1994 |
| Sierra Nevada: The Naturalist's Companion, Revised edition | Paperback | 978-0-520-22488-9 | 2000 |
| Sierra Nevada: The Naturalist's Companion, Revised edition | Hardcover | 978-0-520-20936-7 | 1998 |