Helen Gilkey
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Winter Twigs, Revised Edition
A Wintertime Key to Deciduous Trees and Shrubs of Northwestern Oregon and Western Washington
By Helen Gilkey
Oregon State University Press
Winter Twigs has long been respected and widely used as a unique guide for wintertime identification of the deciduous plants of northwestern Oregon and western Washington (many of the species covered are also found in British Columbia and Alaska), updated in this edition with new nomenclature and contributions.
Handbook of Northwestern Plants Revised Edition
By Helen Gilkey
Oregon State University Press
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