Richard Spellenberg

title	media type	ISBN-13	year of publica- tion	other author(s)
National Audubon Society Field Guide to North American Wildflowers: Western Region - Revised Edition	Turtleback	978-0-375-40233-3	2001
Sonoran Desert Wildflowers: A Field Guide to the Common Wildflowers of the Sonoran Desert, Including Anza-Borrego Desert State Park, Saguaro National Park, Organ Pipe National Monument, Ironwood Forest National Monument, and the Sonoran Portion of Joshua Tree National Park	Paperback	978-0-7627-1136-9	2002
The National Audubon Society Field Guide to North American Wildflowers: Western Region	"	978-0-394-50431-5	1979
Trees of Eastern North America	Hardcover	978-0-691-14590-7	2014	Gil Nelson · Christopher J. Earle
Trees of Eastern North America	Flexibound	978-0-691-14591-4	2014	Gil Nelson · Christopher J. Earle
Trees of Western North America	Hardcover	978-0-691-14579-2	2014	Christopher J. Earle · Gil Nelson
Trees of Western North America	Flexibound	978-0-691-14580-8	2014	Christopher J. Earle · Gil Nelson