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Exact dating by the methods of tree-ring chronology is yet to be accomplished.Mesa Verde National Park, Colorado|Anonymous
Twenty-one of the roof beams in Spruce Tree House have been dated by tree-ring chronology.Mesa Verde National Park|Anonymous
This stand was burned in 1858 (tree-ring date by David Smith) and some charred juniper snags still stood.
The tree-ring dates indicate that the great pueblo at Aztec had undergone at least two major periods of construction.Aztec Ruins National Monument--New Mexico|John M. Corbett