The Dakota Cipher. An Ethan Gage Adventure

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"With President Thomas Jefferson's blessings, Ethan and Magnus embark upon an expedition into the western wilderness--keeping their eyes open for woolly mammoths. But another prize secretly impels them: the mythical hammer of the Norse god Thor, allegedly carried to North America more than a century before Columbus. Across a landscape no white man has ever traversed, Gage's skill will be tested as never before--as he braves unimaginable peril en route to the most incredible discovery of all time." [back cover]