Reference:Critchfield1966a

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Verbatim text: Critchfield, W.B. and E.L. Little Jr. 1966. Geographic Distribution of the Pines of the World. Washington. [U.S.D.A., Misc. Publ. 991.]
Author: Critchfield, W.B., Little, E.L.
Year: 1966
Title: Geographic Distribution of the Pines of the World
Journal: U.S.D.A., Misc. Publ
Volume: 991

... more about "Critchfield1966a"
Critchfield, W.B. +  and Little, E.L. +