[1] Approximate dating. Exact dating by the methods
of tree-ring chronology is yet to be accomplished.
[2] The Secret of the Southwest Solved by Talkative Tree Rings,
by A. E. Douglass: National Geographic Magazine.
December 1929.
[3] For complete bibliography apply at the park museum or
write to the Superintendent, Mesa Verde National Park.
[4] Copies in Mesa Verde Museum Library.
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