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- Book Talks
- The Klamath Mountains: A Natural History
- Conifer Country: A natural history and hiking guide to 35 conifer taxa in the Klamath Mtns.
- Conifers of the Pacific Slope: A field guide to the conifers of California, Oregon, and Washington
- Field Guide to Manzanitas: A story of the California Floristic Province
- California Desert Plants
- Conifers
- Conifers of the Klamath Mountains
- The Miracle Mile
- Conifer Biogeography (emphasis on Pinus)
- Conifers of the Pacific Slope
- Conifers of the San Gabriel Mountains
- High Elevation 5-needle Pines
- Bigcone Douglas-fir
- The Bigfoot Trail: A Botanical Wonderland