By translating the story told by tree rings, we have pushed back the horizons of history in the United States for nearly eight centuries before Columbus reached the shores of the New World...


The Secret of the Southwest Solved by Talkative Tree Rings, National Geographic, Volume 56, Number 6, 1929 (p. 737)

A. E. Douglass Quotes

By translating the story told by tree rings, we have pushed back the horizons of history in the United States for nearly eight centuries before...

By translating the story told by tree rings, we have pushed back the horizons of history in the United States for nearly eight centuries before...

By translating the story told by tree rings, we have pushed back the horizons of history in the United States for nearly eight centuries before...

By translating the story told by tree rings, we have pushed back the horizons of history in the United States for nearly eight centuries before...