Credit: Keith Kanoti, Maine Forest Service, United States | This image is at Forestry Images, a source for forest health, natural resources and silviculture images operated by The Bugwood Network at the University of Georgia and the USDA Forest Service. | License: CC-BY-3.0-US

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

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Credit: Herman, D.E. et al. 1996. North Dakota tree handbook. USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Admin., Bismarck, ND. | USDA | License: PD USDA

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