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Photomicrograph of tree rings in a core from a flood plain

By Fort Collins Science Center
Photomicrograph of tree rings in a core from the flood plain of the Little Missouri River in Theodore Roosevelt National Park
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Photomicrograph of tree rings in a core from the flood plain of the Little Missouri River in Theodore Roosevelt National Park, North Dakota. Ring width of this cottonwood tree was reduced by drought in 1931, 1934, 1936 and 1937. Photo by Jesse Edmondson.

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