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Matt Dannenberg, Paul Szejner, and Erik Anderson core a Ponderosa pine tree in Northern Arizona's Kaibab National Forest. (Photo: Emily Litvack/RDI)
Emily Litvack/RDI Matt Dannenberg, Paul Szejner, and Erik Anderson core a Ponderosa pine tree in Northern Arizona's Kaibab National Forest. (Photo: Emily Litvack/RDI)

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