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Champion Tree - Wikipedia
What Makes a Champion Tree? - Treehugger
Champion Trees - American Forests
Toona sinensis - Wikipedia
SC Champion Trees - Clemson University
What is a Champion Tree? - Cambridge University Botanic Garden
Populus tremuloides - Wikipedia
North Carolina's Champion Trees - N.C. Forest Service
The Lonely Life of a Champion Tree, Aesculus glabra - ResearchGate
Champion Trees Registry - American Forests