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Washington Park Arboretum bulletin - University of Washington. (Published by the Arboretum Foundation for the University of Washington, 2006)

Washington Park Arboretum bulletin - University of Washington. (Published by the Arboretum Foundation for the University of Washington, 2007)

Washington Park Arboretum bulletin - University of Washington. (Published by the Arboretum Foundation for the University of Washington, 2015)

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Wholesale catalog of Pacific coast tree & shrub seeds : for the season 1922 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (C.H. Manning's Sons, 1922)

Wholesale catalog of Pacific coast tree & shrub seeds for the season 1921 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (C.H. Manning's Sons, 1921)

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Wholesale price list of plants, trees and small fruits : spring 1906 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Cox Seed Co, 1906)

Wholesale price list of Rocky Mountain-conifer and native plants : new crop of 1897 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (D.S. Grimes & Son, 1897)

Wholesale price list of seeds : new crop of 1896 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (D.S. Grimes & Son, 1896)

Wholesale price list of seeds of Rocky Mountian conifer and native plants : new crop, 1898 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (D.S. Grimes & Son, 1898)

Wholesale price list spring of 1918 : for nurserymen only - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Nursery Company, 1918)

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Wood and forest - Noyes, William, 1862 -1928 (The Manual arts press, 1921)

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xi bao se su P450 mei xi de jie gou gong neng yu ying yong qian jing - Leng, Xinfu & Qiu Xinghui (ke xue chu ban she, 2001)

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Zeitschrift für Pflanzenkrankheiten (E. Ulmer, 1921)

Zoe:a biological journal (Zoe Publishing Co, 1891)