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Credit: U.S. Geological Survey | Digital representation of "Atlas of United States Trees" by Elbert L. Little, Jr. [1] | License: PD USGS

Credit: Stan Shebs | Own work | License: CC-BY-SA-2.5 CC-BY-SA-3.0-migrated GFDL

Credit: Stan Shebs | Own work | License: CC-BY-SA-2.5 CC-BY-SA-3.0-migrated GFDL

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Credit: Hitchcock, A.S. (rev. A. Chase) | http://plants.usda.g... | License: PD US Government PD USDA NRCS

Credit: Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 174. | USDA | License: PD USDA

Credit: Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 516. | USDA | License: PD USDA

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