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121 Types of Trees (With Pictures and Names) - Identification …
The Tree Guide at arborday.org - Arbor Day Foundation
Tree - Wikipedia
Tree | Definition, Structure, Uses, Importance, & Facts
Common Tree Species - The Nature Conservancy
Trees at arborday.org - Arbor Day Foundation
What Tree Is That? Tree Identification Guide at arborday.org
15 Astounding Facts About Trees - Treehugger
Trees - US Forest Service
29 Purple Flowering Trees (With Pictures): Identification Guide