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Arapaho Glacier has shrunk dramatically since it was photographed in 1898. Measurements collected since 1960 suggest the glacier has thinned by at least 40 meters since then; thinning between 1898 and 1960 is unknown but is probably considerably greater than 40 meters. 1898 photo taken by R. S. Brackett, published in “Arapaho Glacier: A Sixty Year Record,” University of Colorado Studies, Series in Geology, No. 3, R. S. Waldrop (1964). 2003 photo taken by Tad Pfeffer. Images courtesy of Tad Pfeffer, Institute of Arctic and Alpine Research, University of Colorado.


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