Wintertime key to deciduous trees and shrubs of northwestern Oregon and western Washington
Area covered lies between the crest of Cascade Mountains and Pacific Ocean and from the Canadian border southward to the Umpqua Divide in southern Lane County, Oregon
Helen M. Gilkey and Patricia L. Packard
Oregon State University Press, Corvallis, Oregon
6 x 9 inches, paperback
Helen M. Gilkey and Patricia L. Packard, “Winter Twigs,” Nehalem Valley Historical Society Online Archive, accessed December 2, 2021, https://nehalemvalleyhistory.org/omeka/items/show/1826.