Reference:Sudworth1917a

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Verbatim text: Sudworth, G.B. 1917. The Pine Trees of the Rocky Mountain Region. Washington. [U.S.D.A. Bull. 460.]
Author: Sudworth, G.B.
Year: 1917
Title: The Pine Trees of the Rocky Mountain Region
Journal: U.S.D.A. Bull
Volume: 460

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