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Annual rings can be useful for indicating the age of the tree(A)Dicot
Tree Ring Laboratory Home Page
How do tree rings work? – How It Works
Biology for Kids: Trees
New tree ring analysis method may open insights to past climate
Tree Rings, Climate - mrlamarr-stem
In tree rings, like those shown, each "ring" of growth represents what
Dendrochronology - Tree Ring Records of Climate Change
‘Tree Story’ explores what tree rings can tell us about the past