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Sequoioideae - Wikipedia
Redwood Trees: Types, Facts and Identification (With Pictures)
Sequoia sempervirens - Wikipedia
About the Trees - Redwood National and State Parks (U.S.
Redwood - US Forest Service Research and Development
Redwood National and State Parks (U.S. National Park Service)
Redwood Facts - Sempervirens Fund
Understanding redwood history and biology - Treehugger
Coast Redwoods Are Enduring, Adaptable Marvels - Scientific American
Everything to know about Redwood National and State Parks