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Check list of the forest trees of the United States, their names and ranges - Sudworth, George B. (George Bishop), 1864 -1927 (Govt. Print. Off, 1898)

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Cheshire Nursery of the North-Eastern Forestry Company, 1935 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Cheshire Nursery, 1935)

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A classification of forest habitat types of the southern Arizona and portions of the Colorado Plateau - DeVelice, Robert L. (U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1996)

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[Collected reprints, 1911-1931 - Swarth, Harry S. (Harry Schelwald), 1878 -1935 (s.n, 1900)

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Compendium of plant disease and decay fungi in Canada, 1960-1980 - Ginns, J. H. (James Herbert) (Research Branch, Agriculture Canada, 1986)

Components of adaptive variation in pinus contorta from the inland northwest - Intermountain Research Station (Ogden, Utah) (U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, 1987)

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