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The National Arbor Day Foundation: What Tree Is That?
Imagine a world without trees. Students can click on a barren field to see the transformation of the bare dirt by plants and trees. The authors include an online reference guide that lists the benefits of trees and an excellent...
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Morton Arboretum
At the online home of the Morton Arboretum (Lisle, Illinois), learn about its programs, resources, collections, gardens, and special invents.