Arbor Day at the U.S. National Arboretum

Описание к видео Arbor Day at the U.S. National Arboretum

Dr. Richard Olsen tells us about the importance of trees and the work being done at the National Arboretum to study and preserve them.
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This video is available in the following languages:
English:    • Arbor Day at the U.S. National Arboretum  
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