1850364
9780870715303
Helen M. Gilkey was Professor of Botany and Curator of the Herbarium at Oregon State University for more than 30 years.Helen Gilkey is the author of 'Winter Twigs, Revised Edition: A Wintertime Key to Deciduous Trees and Shrubs of Northwestern Oregon and Western Washington', published 2001 under ISBN 9780870715303 and ISBN 0870715305.
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