Analyses of Great Smoky Mountain Red Spruce Tree Ring Data
Great Smoky Mountains National Park; National Park Service
Men observing the tree rings, Congaree National Park, South Carolina
Congaree National Park
Forestry, close up of cross section rings to show retarded growth past 9 years, tree No. 89 over cabin 10, 1938
Mammoth Cave National Park; National Park Service
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