ITHACA, New York, Sept. 2 -- Cornell University posted the following news:

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'Rivers of Ice' exhibit offers lens on glaciers' retreat

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In the late 1800s and early 1900s, Cornell geology professor Ralph Stockmann Tarr led expeditions with his students to Alaska and Greenland to study and photograph their breathtaking glaciers. Captured on fragile plate glass negatives, Tarr's images survive today as records of glacial la . . .

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